The --python24 flag should run only the unit tests inside webkitpy/python24 (e.g. versioning_unittest.py). This gives us an easy way to check that webkitpy/python24 works with Python 2.4. Also, using test-webkitpy with this flag should warn the caller if it is run with a Python version other than Python 2.4.
we don't support python2.4 any more, closing as WONTFIX.