Bug#967707: postgis: depends on deprecated GTK 2

[Sebastiaan Couwenberg]

Control: tags -1 upstream
Control: forwarded -1 https://trac.osgeo.org/postgis/ticket/4666

Upstream has already been asked to port shp2pgsql-gui to GTK 3, and they
have marked the issue as needing funding.

I'll drop the postgis-gui package which provides the shp2pgsql-gui
executable until it has been ported.

Kind Regards,

Bas

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