[Bug 211333] Inconsistent exposure of unlinkat and AT_REMOVEDIR

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211333

            Bug ID: 211333
           Summary: Inconsistent exposure of unlinkat and AT_REMOVEDIR
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dbn at FreeBSD.org

in unistd.h (with some trimming):

#if __POSIX_VISIBLE >= 200809 || __BSD_VISIBLE
int     unlinkat(int, const char *, int);
#endif /* __POSIX_VISIBLE >= 200809 || __BSD_VISIBLE */

however, in fcntl.h (with some trimming):

#if __POSIX_VISIBLE >= 200809
#define AT_REMOVEDIR            0x800   /* Remove directory instead of file */
#endif

Thus, one can define __BSD_VISIBLE but be unable to pass AT_REMOVEDIR to
unlinkat(2).

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