tests/helper-runtests.sh

typing: add type annotations to `mercurial.util.makelock()`

This bubbles up into the `vfs` classes, so get this out of the way.

#
# Avoid interference from actual test env:

unset HGTEST_JOBS
unset HGTEST_TIMEOUT
unset HGTEST_PORT
unset HGTEST_SHELL