xfce4-settings git fails building if --disable-wayland is used due wlr protocol.

Hi

I'm not using wayland here therefore libwindowing is compiled without wayland support. That one worked but settings still has some references to the wlr protocols. Maybe this needs to be looked into ?

---

Build Configuration:

* Installation prefix:              /usr
* Debug Support:                    no
* X11 Support:                      yes
  * Xrandr support:                 yes
  * Xcursor support:                yes
  * Xorg libinput support:          yes
  * Libxklavier support:            yes
  * Libnotify support:              yes
* Wayland Support:                  no
* UPower support:                   no
* Colord support:                   yes
* Mime settings (gio-unix) support: yes
* Sounds settings support:          no

Now type "gmake" to compile.
make  dist-bzip2 am__post_remove_distdir='@:'
make[1]: Entering directory '/home/xxx/Documents/xfce4-settings-master'
make  distdir-am
make[2]: Entering directory '/home/xxx/Documents/xfce4-settings-master'
(GIT_DIR=./.git git log > .changelog.tmp \
&& mv .changelog.tmp ChangeLog; rm -f .changelog.tmp) \
|| (touch ChangeLog; echo 'Git directory not found: installing possibly empty changelog.' >&2)
fatal: not a git repository: './.git'
if test -d "xfce4-settings-4.19.0"; then find "xfce4-settings-4.19.0" -type d ! -perm -200 -exec chmod u+w {} ';' && rm -rf "xfce4-settings-4.19.0" || { sleep 5 && rm -rf "xfce4-settings-4.19.0"; }; else :; fi
test -d "xfce4-settings-4.19.0" || mkdir "xfce4-settings-4.19.0"
 (cd protocols && make  top_distdir=../xfce4-settings-4.19.0 distdir=../xfce4-settings-4.19.0/protocols \
     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)
make[3]: Entering directory '/home/xxx/Documents/xfce4-settings-master/protocols'
**make[3]: *** No rule to make target 'wlr-output-management-unstable-v1.c', needed by 'distdir'.  Stop.**
make[3]: Leaving directory '/home/xxx/Documents/xfce4-settings-master/protocols'
make[2]: *** [Makefile:670: distdir-am] Error 1
make[2]: Leaving directory '/home/xxx/Documents/xfce4-settings-master'
make[1]: *** [Makefile:664: distdir] Error 2
make[1]: Leaving directory '/home/xxx/Documents/xfce4-settings-master'
make: *** [Makefile:772: dist] Error 2
/home/xxx/Documents