Alex Richardson 6ceacebdf5 Unbreak MSG_CMSG_CLOEXEC
MSG_CMSG_CLOEXEC has not been working since 2015 (SVN r284380) because
_finstall expects O_CLOEXEC and not UF_EXCLOSE as the flags argument.
This was probably not noticed because we don't have a test for this flag
so this commit adds one. I found this problem because one of the
libwayland tests was failing.

Fixes:		ea31808c3b07 ("fd: move out actual fp installation to _finstall")
MFC after:	3 days
Reviewed By:	mjg, kib
Differential Revision: https://reviews.freebsd.org/D29328
2021-03-18 20:52:20 +00:00
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