osmocom: Fix the license of the libraries

GPL is too unspecific, point to the right versions
diff --git a/recipes-osmocom/openbsc/openbsc.inc b/recipes-osmocom/openbsc/openbsc.inc
index f60da86..1f71e4d 100644
--- a/recipes-osmocom/openbsc/openbsc.inc
+++ b/recipes-osmocom/openbsc/openbsc.inc
@@ -1,7 +1,7 @@
 DESCRITOPN = "OpenBSC a Free Software GSM BaseStationController"
 DEPENDS = "libdbi libosmocore libosmo-sccp libosmo-abis openggsn"
 HOMEPAGE = "http://openbsc.osmocom.org/"
-LICENSE = "AGPLv3"
+LICENSE = "AGPLv3+"
 LIC_FILES_CHKSUM = "file://COPYING;md5=73f1eb20517c55bf9493b7dd6e480788"
 
 RDEPENDS_osmo-nitb = "libdbd-sqlite3"