c/manpages: Avoid nameshadowing

Signed-off-by: Niels Thykier <niels@thykier.net>
dplint: Discard STDERR from git describe guess_version

Really ought to have been included in commit 4b955a3.

Signed-off-by: Niels Thykier <niels@thykier.net>
lintian: Remove a bit of code duplication

Signed-off-by: Niels Thykier <niels@thykier.net>
lintian: Remove unused variable

Signed-off-by: Niels Thykier <niels@thykier.net>
Don't detect mariadb as embedder of mysql