package/weston: do not try to build dev docs

The developper's documentation will be automatically built when doxygen
is present. But we can't guarantee that it is.

Besides, we are not interested in the devlopper's documentation.

Simply disable it.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/weston/weston.mk

@@ -20,6 +20,7 @@ WESTON_CONF_OPTS = \
 	--with-dtddir=$(STAGING_DIR)/usr/share/wayland \
 	--disable-headless-compositor \
 	--disable-colord \
+	--disable-devdocs \
 	--disable-setuid-install
 
 WESTON_MAKE_OPTS = \