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ps: ignore SIGURG

Tommi Rantalarequested to merge
ttrantala/procps:ps-sigurg into master

Stop registering signal handler for SIGURG, to avoid ps failure if someone sends such signal. Without the signal handler, SIGURG will just be ignored.

  Signal 23 (URG) caught by ps (3.3.16).
  ps:ps/display.c:66: please report this bug

https://man7.org/linux/man-pages/man7/signal.7.html
https://www.freebsd.org/cgi/man.cgi?sektion=3&query=signal

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