[3.6] bpo-33773: Fix test.support.fd_count() on Linux/FreBSD (GH-7421) #7454
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Substract one because listdir() opens internally a file
descriptor to list the content of the /proc/self/fd/ directory.
Add test_support.test_fd_count().
Move also MAXFD code before msvcrt.CrtSetReportMode(), to make sure
that the report mode is always restored on failure.
(cherry picked from commit 492d642)
Co-authored-by: Victor Stinner vstinner@redhat.com
https://bugs.python.org/issue33773