mah-jong upgrade to gtk3

Hi Julian Bradfield,

     mah-jong is a good game software.

But it depend on gtk2 now, would you update it to depend on gtk3?

If don't do so, this software will remove from Debian.

Please see: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1048073


To Bastian:
Could you orphaned mah-jong at first? I would ITA.

The homepage of this software is still exist:
http://mahjong.julianbradfield.org/

The latest version 1.16 is upload on 2020-06-26:
http://mahjong.julianbradfield.org/Linux/

mah-jong is used very popular in east asia country.


To ftpmaster:
Please don't remove this package now.
Thanks!

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