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author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> 1528300640 -0700
committer GitHub <noreply@github.com> 1528300640 -0700
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bpo-33773: Fix test.support.fd_count() on Linux/FreBSD (GH-7421)


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 492d6424a7ca907c8ec1df21e51062e8f3d88e32)

Co-authored-by: Victor Stinner <vstinner@redhat.com>