[gi] Removed hack to avoid using GLib.Variant.new_variant.
[gi] Removed hack to avoid using GLib.Variant.new_variant.

The bug in the annotations of GLib is fixed now.
https://bugzilla.gnome.org/show_bug.cgi?id=639952
https://bugzilla.gnome.org/show_bug.cgi?id=647796

davibe/pygobject,GNOME/pygobject,pexip/pygobject,jdahlin/pygobject,davidmalcolm/pygobject,pexip/pygobject,choeger/pygobject-cmake,MathieuDuponchelle/pygobject,sfeltman/pygobject,pexip/pygobject,jdahlin/pygobject,jdahlin/pygobject,GNOME/pygobject,thiblahute/pygobject,davibe/pygobject,thiblahute/pygobject,davidmalcolm/pygobject,davibe/pygobject,MathieuDuponchelle/pygobject,davidmalcolm/pygobject,thiblahute/pygobject,sfeltman/pygobject,sfeltman/pygobject,choeger/pygobject-cmake,davibe/pygobject,choeger/pygobject-cmake,MathieuDuponchelle/pygobject,GNOME/pygobject