bug#14569: 24.3.50; bootstrap fails on Cygwin

[Paul Eggert]

On 06/27/2013 09:44 AM, Angelo Graziosi wrote:
> In more than six months, only one or two times Emacs, from trunk,
> closed unexpectedly. Usually it is enough stable.

The remaining bug won't cause Cygwin Emacs to close unexpectedly.
What it'll do, is cause Cygwin Emacs to lose track of
its child processes -- it'll think they've finished,
when they haven't, or vice versa.  And it can cause
Cygwin Emacs to kill innocent-bystander processes.
These problems are rare, but I expect they can occur
under Cygwin, just as they used to occur under
POSIXish sytems before we redid child process handling.