3DS: Convert mutexes to light locks
3DS: Convert mutexes to light locks

iracigt/mgba,Anty-Lemon/mgba,fr500/mgba,Iniquitatis/mgba,fr500/mgba,Anty-Lemon/mgba,jeremyherbert/mgba,sergiobenrocha2/mgba,Iniquitatis/mgba,iracigt/mgba,mgba-emu/mgba,libretro/mgba,libretro/mgba,mgba-emu/mgba,fr500/mgba,sergiobenrocha2/mgba,MerryMage/mgba,Iniquitatis/mgba,iracigt/mgba,mgba-emu/mgba,fr500/mgba,iracigt/mgba,Anty-Lemon/mgba,Anty-Lemon/mgba,MerryMage/mgba,jeremyherbert/mgba,libretro/mgba,MerryMage/mgba,sergiobenrocha2/mgba,libretro/mgba,mgba-emu/mgba,jeremyherbert/mgba,sergiobenrocha2/mgba,Iniquitatis/mgba,sergiobenrocha2/mgba,libretro/mgba,jeremyherbert/mgba