gnu: lsh: Fix X11 forwarding.

Fixes <https://issues.guix.gnu.org/24049

>.

* gnu/packages/patches/lsh-fix-x11-forwarding.patch: Add patch.
* gnu/local.mk (dist_patch_DATA): Register it.
* gnu/packages/ssh.scm (lsh)[source]: Apply it.
[inputs]: Add libxau.

Reported-by: myglc2 <myglc2@gmail.com>