vte3: use gdk3-no-gi to test in Travis CI.
vte3: use gdk3-no-gi to test in Travis CI.

This is workaround. Currently, vte3 depends gdk3-no-gi.

kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2