emulators/snes9x-gtk: Update to 1.62.3

Build system has been switched upstream from Meson to CMake.

Drop DEBUGGER option since it has no effect. Even with the definitions
added to build the debugger, the build fails with multiple errors.

https://github.com/snes9xgit/snes9x/releases/tag/1.62
https://github.com/snes9xgit/snes9x/releases/tag/1.62.2
https://github.com/snes9xgit/snes9x/releases/tag/1.62.3