test-helpers: use sysctl() to count open fds on FreeBSD
This allows running the tests on FreeBSD without mounting fdescfs.
Previously you had to run `mount -t fdescfs -o linrdlnk null /dev/fd` to
get file descriptors >=3 listed in /dev/fd.
Signed-off-by: Alex Richardson <Alexander.Richardson@cl.cam.ac.uk>
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