package/x11r7/xserver_xorg-server: add missing dependency for wayland support

The wayland-protocols package is needed to build Xwayland support.

Partly fixes:

  http://autobuild.buildroot.net/results/cf0/cf026e9b18e86b9890341612050f4d166a7b822d/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/x11r7/xserver_xorg-server/xserver_xorg-server.mk

@@ -82,9 +82,9 @@ XSERVER_XORG_SERVER_CONF_OPTS += \
 endif
 
 # Xwayland support needs libdrm, libepoxy, wayland and libxcomposite
-ifeq ($(BR2_PACKAGE_LIBDRM)$(BR2_PACKAGE_LIBEPOXY)$(BR2_PACKAGE_WAYLAND)$(BR2_PACKAGE_XLIB_LIBXCOMPOSITE),yyyy)
+ifeq ($(BR2_PACKAGE_LIBDRM)$(BR2_PACKAGE_LIBEPOXY)$(BR2_PACKAGE_WAYLAND)$(BR2_PACKAGE_WAYLAND_PROTOCOLS)$(BR2_PACKAGE_XLIB_LIBXCOMPOSITE),yyyyy)
 XSERVER_XORG_SERVER_CONF_OPTS += --enable-xwayland
-XSERVER_XORG_SERVER_DEPENDENCIES += libdrm libepoxy wayland xlib_libXcomposite
+XSERVER_XORG_SERVER_DEPENDENCIES += libdrm libepoxy wayland wayland-protocols xlib_libXcomposite
 else
 XSERVER_XORG_SERVER_CONF_OPTS += --disable-xwayland
 endif