Add .mailmap
We have some commits with the author as [...] via arch-releng <arch-releng@archlinux.org>, some who's name is spelled incorrectly, with a wrong email address, etc.
For git log and git shortlog -e, this could be solved with a .mailmap file.
Unfortunately .mailmap is currently not supported by GitLab ( https://gitlab.com/gitlab-org/gitlab/-/issues/14909 ), but that shouldn't really prevent implementing this.
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