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
$ LANG=nonexistent LC_ALL=nonexistent LANGUAGE=nonexistent hg version -q
Mercurial Distributed SCM (version *) (glob)