Qt: Fix build on older versions of Qt
Qt: Fix build on older versions of Qt

Iniquitatis/mgba,libretro/mgba,libretro/mgba,Iniquitatis/mgba,libretro/mgba,mgba-emu/mgba,Iniquitatis/mgba,mgba-emu/mgba,libretro/mgba,Iniquitatis/mgba,mgba-emu/mgba,mgba-emu/mgba,libretro/mgba