run-test: act that we requires MSYS to run the test on Windows
If this ever change we can drop that constrains, however for now it seems clear
to be clear about this limitation.
Differential Revision: https://phab.mercurial-scm.org/D11080
sigpipe-remote: display more information about the non-py3 python
If we are running the wrong things, it is useful to know which wrong thing we
are running.
Differential Revision: https://phab.mercurial-scm.org/D11079