* Upgraded extra/gthumb to 3.11.2
* Fixed variables in extra/{libass,rdesktop,scrcpy,sdl,sdl2}
* Fixed variables in gtk/{gnome-icon-theme,gst-plugins-*,libsigcpp,pygobject3}
* Discarded old CHKSUM512 files from gtk/pygobject3
* Added a fix to remove a gcc option that caused net/hexchat to fail