testing/libretro-mame2003: upgrade to 0_git20240904
https://github.com/libretro/mame2003-libretro/compare/3eb27d5...1a268a7
- Upgrade to current git HEAD
- Fix build error with gcc 14. Version 0_git20220206 also failed to rebuild (error log).
https://github.com/libretro/mame2003-libretro/compare/3eb27d5...1a268a7