System polling: Harden the process calls to account for failure #6230
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Split off from #6217
Fixes #6215
with_process_in was fairly brittle and would display stderr by default and ignore errors. The new version of that function (renamed process_in) now uses Unix.open_process_full and returns None if anything went wrong, fixing the issue on OpenBSD where
getconf LONG_BIT
would fail.Backported to 2.3 in #6228