Issue #15241: Fix test_prefixes failure in test_venv due to symlink in tempfile directory path (i.e. on OS X /tmp is actually /private/tmp).
Issue #15241: Fix test_prefixes failure in test_venv due to symlink in
tempfile directory path (i.e. on OS X /tmp is actually /private/tmp).

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator