bareos-version-from-git: fix output for wip tags

[sebsura]

If the current checkout is tagged as WIP, then git describe will not attach a git hash to its name. This git hash is needed/expected by some of our build tooling.
As such we should tell git to always emit a git hash (except for releases).

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[joergsteffens]

Loos good, it just needs a rebase for the CHANGELOG.