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/cocoa/Classes/NSObject+DDExtensions.m

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2007-2008 Dave Dribin
+ * 
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#import "NSObject+DDExtensions.h"
+#import "DDInvocationGrabber.h"
+
+@implementation NSObject (DDExtensions)
+
+- (id)dd_invokeOnMainThread;
+{
+    return [self dd_invokeOnMainThreadAndWaitUntilDone:NO];
+}
+
+- (id)dd_invokeOnMainThreadAndWaitUntilDone:(BOOL)waitUntilDone;
+{
+    DDInvocationGrabber * grabber = [DDInvocationGrabber invocationGrabber];
+    [grabber setForwardInvokesOnMainThread:YES];
+    [grabber setWaitUntilDone:waitUntilDone];
+    return [grabber prepareWithInvocationTarget:self];
+}
+
+@end