package/matchbox-panel: add support for dnotify

Using dnotify, matchbox-panel can automatically reload its menu.
dnotify requires a kernel >=2.4, which we can consider to be
virtually for granted.

So, forcibly use dnotify.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Arnout Vandecappelle <arnout@mind.be>
Reviewed-by: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/matchbox-panel/matchbox-panel.mk

@@ -11,7 +11,7 @@ MATCHBOX_PANEL_SITE = http://downloads.yoctoproject.org/releases/matchbox/matchb
 MATCHBOX_PANEL_LICENSE = GPLv2+
 MATCHBOX_PANEL_LICENSE_FILES = COPYING
 MATCHBOX_PANEL_DEPENDENCIES = matchbox-lib
-MATCHBOX_PANEL_CONF_OPTS = --enable-expat
+MATCHBOX_PANEL_CONF_OPTS = --enable-expat --enable-dnotify
 
 ifeq ($(BR2_PACKAGE_MATCHBOX_STARTUP_MONITOR),y)
 MATCHBOX_PANEL_CONF_OPTS += --enable-startup-notification