libxkbcommon: disable wayland support

libxkbcommon: disable wayland support

Disable wayland support (only needed for the interactive-wayland
test program). This fixes a compile failure in case wayland
support is autodetected:

    GEN      xdg-shell-unstable-v5-protocol.c
  /bin/sh: /usr/bin/wayland-scanner: No such file or directory
  Makefile:2426: recipe for target 'xdg-shell-unstable-v5-protocol.c' failed
  make[3]: *** [xdg-shell-unstable-v5-protocol.c] Error 127
  make[3]: *** Waiting for unfinished jobs....
    GEN      xdg-shell-unstable-v5-client-protocol.h
  /bin/sh: /usr/bin/wayland-scanner: No such file or directory
  Makefile:2428: recipe for target 'xdg-shell-unstable-v5-client-protocol.h' failed
  make[3]: *** [xdg-shell-unstable-v5-client-protocol.h] Error 127

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>