hgext/__init__.py

tests: use `testrepohg` in one more place in test-check-code.t

This is already used elsewhere in the test to access the current hg repo, and
avoids an error about the unknown `revlog-compression-zstd` when C extensions
aren't built.  The only other such error is in test-check-interfaces.py, but I
don't see a way to avoid it other than to create an empty scratch repo.

Differential Revision: https://phab.mercurial-scm.org/D9364

from __future__ import absolute_import
import pkgutil

__path__ = pkgutil.extend_path(__path__, __name__)