[issue18904] Unnecessary test in file descriptor inheritance test

[Roundup Robot]

Roundup Robot added the comment:

New changeset aea58e1cae75 by Victor Stinner in branch 'default':
Issue #18904: test_os and test_socket use unittest.skipIf() to check if fcntl
http://hg.python.org/cpython/rev/aea58e1cae75

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<http://bugs.python.org/issue18904>
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