remove libircclient from shared library

* removes libircclient from libzetaglest shared library because the
editor and g3d_viewer also link against libzetaglest. Those 2 binaries
don't need libircclient support

* libircclient is now built directly into only the zetaglest binary

* moved libircclient from source/shared_lib because it's no longer part
of the shared library

* libircclient put in dir "external/" because it is an "external" or
"3rd" party library. The @Supertux project does something similar

external/libircclient/include/libirc_errors.h

@@ -0,0 +1,235 @@
+/* 
+ * Copyright (C) 2004-2012 George Yunaev gyunaev@ulduzsoft.com
+ *
+ * This library is free software; you can redistribute it and/or modify it 
+ * under the terms of the GNU Lesser General Public License as published by 
+ * the Free Software Foundation; either version 3 of the License, or (at your 
+ * option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but WITHOUT 
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public 
+ * License for more details.
+ */
+
+#ifndef INCLUDE_IRC_ERRORS_H
+#define INCLUDE_IRC_ERRORS_H
+
+#ifndef IN_INCLUDE_LIBIRC_H
+	#error This file should not be included directly, include just libircclient.h
+#endif
+
+
+/*! brief No error
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_OK			0
+
+
+/*! \brief Invalid argument
+ * 
+ * An invalid value was given for one of the arguments to a function. 
+ * For example, supplying the NULL value for \a channel argument of 
+ * irc_cmd_join() produces LIBIRC_ERR_INVAL error. You should fix the code.
+ *
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_INVAL		1
+
+
+/*! \brief Could not resolve host.
+ * 
+ * The host name supplied for irc_connect() function could not be resolved
+ * into valid IP address. Usually means that host name is invalid.
+ *
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_RESOLV		2
+
+
+/*! \brief Could not create socket.
+ * 
+ * The new socket could not be created or made non-blocking. Usually means
+ * that the server is out of resources, or (rarely :) a bug in libircclient.
+ *
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_SOCKET		3
+
+
+/*! \brief Could not connect.
+ * 
+ * The socket could not connect to the IRC server, or to the destination DCC
+ * part. Usually means that either the IRC server is down or its address is 
+ * invalid. For DCC the reason usually is the firewall on your or destination
+ * computer, which refuses DCC transfer.
+ *
+ * \sa irc_run irc_connect
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_CONNECT		4
+
+
+/*! \brief Connection closed by remote peer.
+ * 
+ * The IRC connection was closed by the IRC server (which could mean that an 
+ * IRC operator just have banned you from the server :)), or the DCC connection
+ * was closed by remote peer - for example, the other side just quits his mIrc.
+ * Usually it is not an error.
+ *
+ * \sa irc_run irc_connect irc_dcc_callback_t
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_CLOSED		5
+
+
+/*! \brief Out of memory
+ * 
+ * There are two possible reasons for this error. First is that memory could 
+ * not be allocated for libircclient use, and this error usually is fatal.
+ * Second reason is that the command queue (which keeps command ready to be 
+ * sent to the IRC server) is full, and could not accept more commands yet.
+ * In this case you should just wait, and repeat the command later.
+ *
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_NOMEM		6
+
+
+/*! \brief Could not accept new connection
+ * 
+ * A DCC chat/send connection from the remote peer could not be accepted.
+ * Either the connection was just terminated before it is accepted, or there 
+ * is a bug in libircclient.
+ *
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_ACCEPT		7
+
+
+/*! \brief Could not send this
+ * 
+ * A \a filename supplied to irc_dcc_sendfile() could not be sent. Either is 
+ * is not a file (a directory or a socket, for example), or it is not readable. *
+ *
+ * \sa LIBIRC_ERR_OPENFILE
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_NODCCSEND	9
+
+
+/*! \brief Could not read DCC file or socket
+ * 
+ * Either a DCC file could not be read (for example, was truncated during 
+ * sending), or a DCC socket returns a read error, which usually means that
+ * the network connection is terminated.
+ *
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_READ			10
+
+
+/*! \brief Could not write DCC file or socket
+ * 
+ * Either a DCC file could not be written (for example, there is no free space
+ * on disk), or a DCC socket returns a write error, which usually means that
+ * the network connection is terminated.
+ *
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_WRITE		11
+
+
+/*! \brief Invalid state
+ * 
+ * The function is called when it is not allowed to be called. For example,
+ * irc_cmd_join() was called before the connection to IRC server succeed, and
+ * ::event_connect is called.
+ *
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_STATE		12
+
+
+/*! \brief Operation timed out
+ * 
+ * The DCC request is timed out. 
+ * There is a timer for each DCC request, which tracks connecting, accepting
+ * and non-accepted/declined DCC requests. For every request this timer
+ * is currently 60 seconds. If the DCC request was not connected, accepted
+ * or declined during this time, it will be terminated with this error.
+ *
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_TIMEOUT		13
+
+
+/*! \brief Could not open file for DCC send
+ * 
+ * The file specified in irc_dcc_sendfile() could not be opened.
+ *
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_OPENFILE		14
+
+
+/*! \brief IRC server connection terminated
+ * 
+ * The connection to the IRC server was terminated - possibly, by network 
+ * error. Try to irc_connect() again.
+ *
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_TERMINATED	15
+
+
+/*! \brief IPv6 not supported
+ * 
+ * The function which requires IPv6 support was called, but the IPv6 support was not compiled
+ * into the application
+ *
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_NOIPV6		16
+
+
+/*! \brief SSL not supported
+ * 
+ * The SSL connection was required but the library was not compiled with SSL support
+ *
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_SSL_NOT_SUPPORTED		17
+
+
+/*! \brief SSL initialization failed
+ * 
+ * The SSL connection was required but the library was not compiled with SSL support
+ *
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_SSL_INIT_FAILED			18
+
+
+/*! \brief SSL connection failed
+ * 
+ * SSL handshare failed when attempting to connect to the server. Typically this means you're trying
+ * to use SSL but attempting to connect to a non-SSL port.
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_CONNECT_SSL_FAILED		19
+
+
+/*! \brief SSL certificate verify failed
+ * 
+ * The server is using the self-signed certificate. Use LIBIRC_OPTION_SSL_NO_VERIFY option to connect to it.
+ * \ingroup errorcodes
+ */
+#define LIBIRC_ERR_SSL_CERT_VERIFY_FAILED	20
+
+
+// Internal max error value count.
+// If you added more errors, add them to errors.c too!
+#define LIBIRC_ERR_MAX			21
+
+#endif /* INCLUDE_IRC_ERRORS_H */