lighttpd: webdav locks require libuuid

Since 1.4.40 webdav locks require libuuid from util-linux, so make it an
automatic dependency. Fixes:
http://autobuild.buildroot.net/results/b14/b14484300b4acfcaa18593b097167cef14330898/

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

package/lighttpd/lighttpd.mk

@@ -46,7 +46,13 @@ endif
 
 ifeq ($(BR2_PACKAGE_LIGHTTPD_WEBDAV),y)
 LIGHTTPD_DEPENDENCIES += libxml2 sqlite
-LIGHTTPD_CONF_OPTS += --with-webdav-props --with-webdav-locks
+LIGHTTPD_CONF_OPTS += --with-webdav-props
+ifeq ($(BR2_PACKAGE_UTIL_LINUX_LIBUUID),y)
+LIGHTTPD_CONF_OPTS += --with-webdav-locks
+LIGHTTPD_DEPENDENCIES += util-linux
+else
+LIGHTTPD_CONF_OPTS += --without-webdav-locks
+endif
 else
 LIGHTTPD_CONF_OPTS += --without-webdav-props --without-webdav-locks
 endif