libICE: modernize.
libXau: update to 1.0.8.
libXdmcp: modernize.
libXfontcache: update to 1.0.5.
libao: modernize.
less: build PIE bins.
gtk-vnc: update to 0.5.3.
libass: update to 0.10.2 (soname bump).
Revbump pkgs that link against libass.
python-MarkupSafe: update to 0.23

Build python3 module too