weston: handle webp dependency

It doesn't have an enable/disable switch so it's just the dependency.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/weston/weston.mk

@@ -11,7 +11,8 @@ WESTON_LICENSE = MIT
 WESTON_LICENSE_FILES = COPYING
 
 WESTON_DEPENDENCIES = host-pkgconf wayland wayland-protocols \
-	libxkbcommon pixman libpng jpeg mtdev udev cairo libinput
+	libxkbcommon pixman libpng jpeg mtdev udev cairo libinput \
+	$(if $(BR2_PACKAGE_WEBP),webp)
 
 WESTON_CONF_OPTS = \
 	--with-dtddir=$(STAGING_DIR)/usr/share/wayland \