build: get latest release tag via git-describe

To automatically create the shortlog for the .MAIL_MSG, we use
git shortlog. However, we do not want to include old stuff, so
let only commits pass that were between the previous release and
now. (Untested for now, since there is no futher tag.)

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>

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