In some cases this will introduce cycles which could likely be cleaned
up by only depending on some unix tools instead of the whole autotools.
Rebuilding doesn't make much sense at this point since it just adds a subset
of base-devel which is still installed by default.
The `tmate` project forked the `tmux` code to allow for easy,
almost-instantaneous pair programming in the console.
Using this project, the GitHub Action
https://github.com/marketplace/actions/debugging-with-tmate allows
debugging build failures interactively.
Unfortunately, `tmate` does not offer any support for Windows.
MSYS2 to the rescue! We just added package definitions for `msgpack-c`
and `libssh`, which are the two previously missing dependencies of
`tmate`, and with this commit, we add the package definition for `tmate`
itself.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
