HGKeeper

Remove code for no-longer supported GTK

2021-10-09, Elliott Sales de Andrade

cdb6fdb07bc4

Remove code for no-longer supported GTK

We require GTK 3.24 now.

Testing Done:
Compile only.

Reviewed at https://reviews.imfreedom.org/r/1012/

Jefferson Carpenter (negatratoron): logo.png

ivanhoe <ivanhoe@fiscari.de>

Gary Kramlich <grim@reaperworld.com>

Mike Ruprecht <cmaiku@gmail.com>

Elliott Sales de Andrade <quantum.analyst@gmail.com>

Sorvival <sorvival@tutanota.com>