Use -std=gnu99 for PS3 instead of -std=c99
Use -std=gnu99 for PS3 instead of -std=c99

This is a fix from endrift to avoid many build failures.
fr500/mgba,libretro/mgba,fr500/mgba,libretro/mgba,libretro/mgba,fr500/mgba,fr500/mgba,libretro/mgba,libretro/mgba