purple-facebook-6a0a79182ebc

• Added check to autoconf for glib-genmarshal
• Added missing g_get_real_time() compat function
• Added option to autoconf for extra compiler warnings
• Depend on and link to gobject-2.0
• Fixed deleted XMAs being fatal
• Fixed improper handling of queue errors
• Fixed possible NULL string comparison
• Fixed the contact query not fetching non-users
• Fixed the debian dependencies
• Implemented group chat topic change events
• Minor code refactoring

Windows builds here