configure.ac: Error out in case autoconf-archive isn't installed
configure.ac: Error out in case autoconf-archive isn't installed

Check whether the AX_IS_RELEASE macro is defined and if not print
a proper error message.

https://bugzilla.gnome.org/show_bug.cgi?id=784428

pexip/pygobject,GNOME/pygobject,pexip/pygobject,GNOME/pygobject,pexip/pygobject,GNOME/pygobject