test: make test-propertycache.py python2.4 compatible

The subprocess module have not `check_call` method in python2.4. Fall back to
calling `check` with return code verification.

tests/test-propertycache.py

@@ -42,7 +42,7 b' mercurial.localrepo.localrepository.test'
 # create an empty repo. and instanciate it. It is important to run
 # those test on the real object to detect regression.
 repopath = os.path.join(os.environ['TESTTMP'], 'repo')
-subprocess.check_call(['hg', 'init', repopath])
+assert subprocess.call(['hg', 'init', repopath]) == 0
 ui = uimod.ui()
 repo = mercurial.hg.repository(ui, path=repopath).unfiltered()