dix-config.h: add HAVE_SOCKLEN_T definitionserver-21.1-branch

Needed to build with IPv6 disabled using gcc 14 on some platforms to avoid:

In file included from /usr/X11/include/X11/Xtrans/transport.c:67,
                 from xstrans.c:17:
/usr/X11/include/X11/Xtrans/Xtranssock.c: In function ‘_XSERVTransSocketOpen’:
/usr/X11/include/X11/Xtrans/Xtranssock.c:467:28: error: passing argument 5
 of ‘getsockopt’ from incompatible pointer type [-Wincompatible-pointer-types]
  467 |             (char *) &val, &len) == 0 && val < 64 * 1024)
      |                            ^~~~
      |                            |
      |                            size_t * {aka long unsigned int *}

(Backport to xserver-21.1-branch of commit a1b5aa5a7f12adc43720a5ae11e6c.
 Backport adds autoconf equivalent to meson change from master branch.)

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1737>

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