GBA Core: Fix missing include
GBA Core: Fix missing include

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