debug: Fix clang mq_open fortify wrapper (BZ 31917)

The mqueue.h fortify wrapper for clang added by c23107ef
is not fully correct, where correct 4 argument usage are not
being correctly handled.  For instance, while building socat 1.8
with a yocto clang based system shows:

  ./socat-1.8.0.0/xio-posixmq.c:119:8: error: 'mq_open' is unavailable: mq_open can be called either with 2 or 4 arguments
    119 |         mqd = mq_open(name, oflag, opt_mode, NULL);
        |               ^
  [...] /usr/include/bits/mqueue2.h:66:8: note: 'mq_open' has been explicitly marked unavailable here
     66 | __NTH (mq_open (const char *__name, int __oflag, mode_t mode,
        |        ^
  1 error generated.

The correct way to define the wrapper is to set invalid usage
with __fortify_clang_unavailable (for the case with 5 or more
arguments), followed by the expected ones.  This fix make mq_open
similar to current open wrappers.

[1] http://www.dest-unreach.org/socat/



Reported-by: Khem Raj <raj.khem@gmail.com>
Acked-by: Khem Raj <raj.khem@gmail.com>