Bug#911329: add .libretro metadata for better integration with gnome-games

[Patrick Ammann]

Package: libretro-gambatte
Version: 0.5.0+git20160522+dfsg1-1


Please consider adding .libretro metadata for better integration with 
gnome-games.


See 
https://gitlab.gnome.org/GNOME/gnome-games/blob/master/flatpak/libretro-cores/gambatte.libretro:
<snip>
[Libretro]
Type=Emulator
Version=1.0
Name=Gambatte
Module=gambatte_libretro.so
LibretroVersion=1
Authors=Sinamas;
License=GPL-2.0+;

[Platform:GameBoy]
MimeType=application/x-gameboy-rom;

[Platform:GameBoyColor]
MimeType=application/x-gameboy-color-rom;
</snip>

The file gambatte.libretro is expected to be here 
"/usr/lib/x86_64-linux-gnu/libretro/"


Thanks,
Patrick