Make pango_interface_age automatic
Make pango_interface_age automatic

For unstable releases, we act as if each micro release has new API.
For stable releases, no micro release adds new API.

Distrotech/pango,Distrotech/pango,danny-ku/pango,kari-lentz/alpha-pango,kari-lentz/alpha-pango,OpenInkpot-archive/iplinux-pango1.0,danny-ku/pango,danny-ku/pango,OpenInkpot-archive/iplinux-pango1.0,kari-lentz/alpha-pango,OpenInkpot-archive/iplinux-pango1.0,Distrotech/pango,kari-lentz/alpha-pango