[patch] Multithreaded process left Stopped (T) on CTRL-C of strace

[Roland McGrath]

> -					detach(leader, sig);
> +					if (!(leader->flags & TCB_EXITING))
> +						detach(leader, sig);

This test should rule out the PTRACE_KILL too, and set TCB_GROUP_EXITING.
I committed it with that modification.

Thanks,
Roland