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start taming chromium in low FD situations; starting with disk cache
cap the file descriptor limit at 85% of the size of the
file descriptor table and also substract the amount of
currently used file descriptors as this should give us
enough reserve to avoid hitting the limit
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update file path watcher code to match the kqueue implementation
and disable some FD passing code that is not used on OpenBSD
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2d07d16bb3