Fixed copyright date.

include/SDL_config_winrt.h

@@ -1,6 +1,6 @@
 /*
   Simple DirectMedia Layer
-  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
+  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages