Add Python version into installed libpyglib name
Add Python version into installed libpyglib name

Do this now, while no-one (as far as we know) links to the library
besides PyGObject itself.  Bug #550235.

nzjrs/pygio,nzjrs/pygio,GNOME/pygio,GNOME/pygio,nzjrs/pygio,GNOME/pygio