wip/git-multimail 1.5.0 NetBSD

git-multimail is a tool for sending notification emails on pushes to a Git repository. It includes a Python module called git_multimail.py, which can either be used as a hook script directly or can be imported as a Python module into another script.

git-multimail is derived from the Git project's old contrib/hooks/post-receive-email, and is mostly compatible with that script.