test-run-tests: do not rebuild hg in the test d600bda4 and fc0f3ed0 added code to call `$PYTHON run-tests.py ...`. That will rebuild hg, is slow and could have other crashes from setup.py, like: Unable to find a working hg binary to extract the version from the repository tags Therefore use `run-tests.py -l` instead. Differential Revision: https://phab.mercurial-scm.org/D1595