Rewrite popen for SUSv3 compliance.   Added a list of popen()'d to store pids and use waitpid() in pclose().   Loop on waitpid() failure due to EINTR as required.   Close parent's popen()'d FILEs in the {v}fork()'d child.   Fix failure exit code for failed execve().
Rewrite popen for SUSv3 compliance.
  Added a list of popen()'d to store pids and use waitpid() in pclose().
  Loop on waitpid() failure due to EINTR as required.
  Close parent's popen()'d FILEs in the {v}fork()'d child.
  Fix failure exit code for failed execve().

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