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top: Ignore SIGURG

Tommi Rantala requested to merge tt.rantala/procps:top-sigurg into master

Ignore SIGURG also for top, see merge request for ps !142 (merged)

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

signal 23 (URG) was caught by top, please
send bug reports to <procps@freelists.org>

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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