Merge branch 'jc/shortlog-ref-exclude' into maint

"git log --exclude=<glob> --all | git shortlog" worked as expected, but "git shortlog --exclude=<glob> --all", which is supposed to be identical to the above pipeline, was not accepted at the command line argument parser level. * jc/shortlog-ref-exclude: shortlog: allow --exclude=<glob> to be passed