matchbox-desktop: fix link issue against libdl

matchbox-desktop uses dlopen(), so it needs to link against libdl. The
configure.ac and Makefile.am have the necessary provisions to do so,
but the included configure script does not replace LIBADD_DL in
src/Makefile.am as it should.

Therefore, we force the autoreconf of the package, which solves the
problem.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/matchbox/matchbox-desktop/matchbox-desktop.mk

@@ -13,6 +13,11 @@ MATCHBOX_DESKTOP_LICENSE_FILES = COPYING
 MATCHBOX_DESKTOP_DEPENDENCIES = matchbox-lib
 MATCHBOX_DESKTOP_CONF_OPT = --enable-expat
 
+# The bundled configure script does not properly replace LIBADD_DL, so
+# we force an autoreconf even if we don't have any patches touching
+# configure.ac/Makefile.am.
+MATCHBOX_DESKTOP_AUTORECONF = YES
+
 #############################################################
 
 ifeq ($(BR2_PACKAGE_STARTUP_NOTIFICATION),y)