Update to 20160106 OS X Preview for Developers release.

byuu says:

New update. Most of the work today went into eliminating hiro::Image
from all objects in all ports, replacing with nall::image. That took an
eternity.

Changelog:
- fixed crashing bug when loading games [thanks endrift!!]
- toggling "show status bar" option adjusts window geometry (not
  supposed to recenter the window, though)
- button sizes improved; icon-only button icons no longer being cut off

nall/database/odbc.hpp

@@ -1,5 +1,4 @@
-#ifndef NALL_DATABASE_ODBC_HPP
-#define NALL_DATABASE_ODBC_HPP
+#pragma once
 
 #include <nall/string.hpp>
 
@@ -296,5 +295,3 @@ private:
 };
 
 }}
-
-#endif

nall/database/sqlite3.hpp

@@ -1,5 +1,4 @@
-#ifndef NALL_DATABASE_SQLITE3_HPP
-#define NALL_DATABASE_SQLITE3_HPP
+#pragma once
 
 /* SQLite3 C++ RAII wrapper for nall
  *
@@ -202,5 +201,3 @@ protected:
 };
 
 }}
-
-#endif