Fix SDL2 library exporting
Fix SDL2 library exporting

iracigt/mgba,fr500/mgba,libretro/mgba,Iniquitatis/mgba,AdmiralCurtiss/mgba,cassos/mgba,askotx/mgba,mgba-emu/mgba,MerryMage/mgba,askotx/mgba,sergiobenrocha2/mgba,iracigt/mgba,zerofalcon/mgba,jeremyherbert/mgba,mgba-emu/mgba,zerofalcon/mgba,MerryMage/mgba,Touched/mgba,Anty-Lemon/mgba,sergiobenrocha2/mgba,Anty-Lemon/mgba,Touched/mgba,fr500/mgba,jeremyherbert/mgba,cassos/mgba,Iniquitatis/mgba,sergiobenrocha2/mgba,iracigt/mgba,Anty-Lemon/mgba,mgba-emu/mgba,iracigt/mgba,bentley/mgba,askotx/mgba,cassos/mgba,zerofalcon/mgba,sergiobenrocha2/mgba,AdmiralCurtiss/mgba,Iniquitatis/mgba,matthewbauer/mgba,AdmiralCurtiss/mgba,libretro/mgba,matthewbauer/mgba,Touched/mgba,nattthebear/mgba,jeremyherbert/mgba,libretro/mgba,jeremyherbert/mgba,Iniquitatis/mgba,askotx/mgba,Anty-Lemon/mgba,MerryMage/mgba,bentley/mgba,libretro/mgba,mgba-emu/mgba,libretro/mgba,sergiobenrocha2/mgba,fr500/mgba,fr500/mgba,nattthebear/mgba