Log Message:
[libretro-]snes9x[-gtk]: Update to 1.63

Snes9x 1.63
General:
- Added a shortcut to change the backdrop color for sprite extraction.
- Fixed QuickSave 0-9 slot shortcuts not working.
- Allow "Address:byte" form for cheat inputs.
- Fixed ZIP files not being closed after patch search.
- Various memmap fixes to allow unofficial mappings.
- Added usage of ImGui to draw things on top of the screen instead of inside.

Gtk:
- Fixed config file location to never put files directly in $HOME and obey
  $XDG_CONFIG_HOME.
- Updated translations from JakeSmarter and StanleyKid-22.