release-srpm: Resolve tarball symlinks early
release-srpm: Resolve tarball symlinks early

For tarballs that are symlinks to an actual tarball, we resolve
those before trying to perhaps trying to parse a tag from them.

Closes #85
stefwalter/cockpituous,cockpit-project/cockpituous,cockpit-project/cockpituous,stefwalter/cockpituous