ProcessUNIX: Fix kwsysProcessesSignalHandler() if !KWSYSPE_USE_SIGINFO

Ali Mohammad Purrequested to merge
alimpfard/kwsys:kwsys-unix into master
  • struct sigaction& is not a valid C type name, its usage suggests that it was intended to be a pointer.
  • newSigChldAction does not exist, appears to have just been forgotten in a change?
  • return 0 from a void function.

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