fork failure patch for cygrunsrv

[Hochstedler, Ben (GE Healthcare)]

fork() can fail when the system runs out of non-interactive heap space
(because there's not enough heap memory to allocate to the launched
process). See:
http://support.microsoft.com/default.aspx?scid=kb;en-us;824422

The attached patch fixes two problems:
1. cygrunsrv doesn't exit when fork returns -1 (failed to
   spawn child process)
2. log message doesn't include the proper errno of the
   fork failure.

Ben Hochstedler



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