SDL: Add preliminary fullscreen toggle support. Does not seem to work very well on Mac.
SDL: Add preliminary fullscreen toggle support. Does not seem to work very well on Mac.

unknownbrackets/native,libretro/ppsspp-native,unknownbrackets/native,libretro/ppsspp-native,hrydgard/native,zhykzhykzhyk/ppsspp-native,zhykzhykzhyk/ppsspp-native,zhykzhykzhyk/ppsspp-native,hrydgard/native,libretro/ppsspp-native,unknownbrackets/native,hrydgard/native,hrydgard/native,libretro/ppsspp-native,zhykzhykzhyk/ppsspp-native,unknownbrackets/native