Subtle change to SIGCHLD polling

If you're using POE for process management, then I may have made a =
change that affects you.  It's especially relevant to people using =
_signal to handle SIGCHLD, people using SIGCHLD polling (legacy Perl =
users who don't trust "safe signals"), and people using a MSWin32 Perl =
like ActiveState or Strawberry.

Please review the change in the repository and give it a spin before it =
ends up on CPAN.  The build you save may be your own.

=
https://github.com/rcaputo/poe/commit/d3cb2fbfb53799ab22754b900fc47af70375=
8910

commit d3cb2fbfb53799ab22754b900fc47af703758910
Author: Rocco Caputo <[email protected]>
Date:   Sun Oct 6 16:58:28 2013 -0400

    Fix a "Kernel has child processes" warning even when it doesn't.

    Michel Schrameck reported that the above warning was coming from a
    very simple, obviously not fork()ing test program.  I was able to
    reproduce the problem with the test case when USE_SIGCHLD was turned
    off.  This fix changes the way first polling of SIGCHLD happens.  It
    passes all known tests, but it may negatively affect older programs.
    Please report any problems.

--=20
Rocco Caputo <[email protected]>