added option to use XFB in GL, but XFB support still needs work. modified viewport to include scissor offset.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@879 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Plugins/Plugin_VideoOGL/Src/Render.h

@@ -73,6 +73,8 @@ public:
     // Finish up the current frame, print some stats
     static void Swap(const TRectangle& rc);
 
+	static void SwapBuffers();
+
     static bool SaveRenderTarget(const char* filename, int jpeg);
 };