text: Clean up the set_font_description_internal() semantics
text: Clean up the set_font_description_internal() semantics

The current semantics are ridiculous, and clearly a case of (mistaken)
premature optimization. All setters should copy, not transfer ownership.

https://bugzilla.gnome.org/show_bug.cgi?id=695119

djdeath/clutter,Distrotech/clutter,heysion/clutter-clone,ebassi/clutter,collects/clutter,heysion/clutter-clone,jigpu/clutter,heysion/clutter-clone,heysion/clutter-clone,djdeath/clutter,collects/clutter,heysion/clutter-clone,GNOME/clutter,jigpu/clutter,GNOME/clutter,collects/clutter,Distrotech/clutter,djdeath/clutter-android,GNOME/clutter,Distrotech/clutter,Distrotech/clutter,jigpu/clutter,djdeath/clutter-android,ebassi/clutter,djdeath/clutter,ebassi/clutter,GNOME/clutter,jigpu/clutter,djdeath/clutter-android,djdeath/clutter-android,ebassi/clutter,djdeath/clutter,ebassi/clutter,djdeath/clutter,GNOME/clutter,jigpu/clutter,djdeath/clutter-android,djdeath/clutter,Distrotech/clutter,collects/clutter,Distrotech/clutter,jigpu/clutter,collects/clutter