gvfs: use explicit --enable-gudev option

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gvfs/gvfs.mk

@@ -44,6 +44,9 @@ endif
 
 ifeq ($(BR2_PACKAGE_LIBGUDEV),y)
 GVFS_DEPENDENCIES += libgudev
+GVFS_CONF_OPTS  += --enable-gudev
+else
+GVFS_CONF_OPTS += --disable-gudev
 endif
 
 ifeq ($(BR2_PACKAGE_LIBARCHIVE),y)