MFC r264628: fcntl.h: Make visible various POSIX.1-2008 features.
MFC r264628: fcntl.h: Make visible various POSIX.1-2008 features.

Also, remove #if __BSD_VISIBLE where it is redundant. When __BSD_VISIBLE is
defined to 1, __POSIX_VISIBLE, __XSI_VISIBLE and __ISO_C_VISIBLE are also
defined to the newest supported version.

PR:		188173

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