build: Bind interface age to minor and micro version
build: Bind interface age to minor and micro version

Instead of requiring to manually update the interface age, we can simply
check for the minor version, and either set it to 0 for development
releases, or set it to the micro version for stable one. We don't do API
additions in micro releases anyway.

GNOME/clutter,GNOME/clutter,GNOME/clutter,GNOME/clutter,GNOME/clutter