Add new ports: spice-gtk and py-spice-gtk

spice-gtk is a GTK+2 and GTK+3 SPICE widget. It features glib-based objects
for SPICE protocol parsing and a gtk widget for embedding the SPICE display
into other applications such as virt-manager.
Python bindings are available too.

WWW: http://www.spice-space.org/

PR: 196949 (based on)
Submitted by: olevole@olevole.ru