Add missing object reference count increment for addsitedir() to avoid process crashing when WSGIPythonPath was used.
Add missing object reference count increment for addsitedir() to avoid
process crashing when WSGIPythonPath was used.

paboldin/mod_wsgi,Zunonia/mod_wsgi,SGCreations/mod_wsgi,Zunonia/mod_wsgi,frewsxcv/mod_wsgi,paboldin/mod_wsgi,paboldin/mod_wsgi,Zunonia/mod_wsgi,MinFu/mod_wsgi,MinFu/mod_wsgi,GrahamDumpleton/mod_wsgi,MinFu/mod_wsgi,frewsxcv/mod_wsgi,paboldin/mod_wsgi,MinFu/mod_wsgi,Zunonia/mod_wsgi,frewsxcv/mod_wsgi,GrahamDumpleton/mod_wsgi,GrahamDumpleton/mod_wsgi,SGCreations/mod_wsgi,SGCreations/mod_wsgi,SGCreations/mod_wsgi,frewsxcv/mod_wsgi