Make our own version of multiprocessing._cleanup that doesn't die if the process is gone.
Make our own version of multiprocessing._cleanup that doesn't die if the
process is gone.

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