Remove variables from the platform-independent GDK API
gdk_threads_mutex, gdk_threads_lock and gdk_threads_unlock are removed from public API. gdk_threads_mutex was deprecated already. Instead of using gdk_threads_lock and _unlock one was presumably supposed to use the GDK_THREADS_ENTER and _LEAVE macros, which now simply call the corresponding gdk_threads_enter() and _leave() functions. Remove he dllimport/dllexport ugliness for GDK for Windows. There is still a gdk_display variable being exported by the X11 backend.
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