Fix for FBO on iOS devices (from rock88).
Fix for FBO on iOS devices (from rock88).

zhykzhykzhyk/ppsspp-native,unknownbrackets/native,hrydgard/native,Ced2911/native,Ced2911/native,libretro/ppsspp-native,libretro/ppsspp-native,unknownbrackets/native,hrydgard/native,zhykzhykzhyk/ppsspp-native,Ced2911/native,hrydgard/native,unknownbrackets/native,unknownbrackets/native,libretro/ppsspp-native,libretro/ppsspp-native,zhykzhykzhyk/ppsspp-native,hrydgard/native,zhykzhykzhyk/ppsspp-native