tests/testlib/common.sh

typing: add some trivial type hints to `mercurial/match.py`

These were new methods since hg 3dbc7b1ecaba, but surprisingly pytype couldn't
figure them out.

mkcommit() {
   name="$1"
   shift
   echo "$name" > "$name"
   hg add "$name"
   hg ci -m "$name" "$@"
}