mkfifo-tests, etc.: allow HP-UX 11.11 bug Problem reported by Daniel Richard G. in <http://lists.gnu.org/archive/html/bug-gnulib/2013-10/msg00068.html>. * doc/posix-functions/mkfifo.texi (mkfifo): * doc/posix-functions/mkfifoat.texi (mkfifoat): * doc/posix-functions/mknod.texi (mknod): * doc/posix-functions/mknodat.texi (mknodat): Document the HP-UX 11.11 bug. * tests/test-mkfifo.h (test_mkfifo): Allow the HP-UX 11.11 bug.