GBA: Fix expected entry point for multiboot ELFs (fixes #2450)
GBA: Fix expected entry point for multiboot ELFs (fixes #2450)

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