zombies on the system. Without this change, the socks5 daemon would
work great for a short period of time, then hang because no more
children could be created. It appears from debugging that this is
because gravedigger was only called once. I reestablish the signal
handler in gravedigger to force SIGCHLD to be unmasked.
A more proper fix might be to fix Signal to have multi-shot signals,
or to see what might be broken with the signal masks. Since I'm in a
hurry and this port's daemon is broken without this, I commit this
kludge knowing that it will live approximately forever, less three
days.
