matchbox-lib: fix license info

Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/matchbox/matchbox-lib/matchbox-lib.mk

@@ -7,7 +7,7 @@
 MATCHBOX_LIB_VERSION = 1.9
 MATCHBOX_LIB_SOURCE = libmatchbox-$(MATCHBOX_LIB_VERSION).tar.bz2
 MATCHBOX_LIB_SITE = http://downloads.yoctoproject.org/releases/matchbox/libmatchbox/$(MATCHBOX_LIB_VERSION)
-MATCHBOX_LIB_LICENSE = LGPLv2.1
+MATCHBOX_LIB_LICENSE = LGPLv2.1+
 MATCHBOX_LIB_LICENSE_FILES = COPYING
 MATCHBOX_LIB_INSTALL_STAGING = YES
 MATCHBOX_LIB_DEPENDENCIES = host-pkgconf expat xlib_libXext