Negate test for available os.fork (thanks miracle2k)
Negate test for available os.fork (thanks miracle2k)

mitsuhiko/celery,frac/celery,WoLpH/celery,WoLpH/celery,ask/celery,ask/celery,cbrepo/celery,mitsuhiko/celery,cbrepo/celery,frac/celery