libosmocore: Introduce 0.5.3 and bump the META_TELEPHONY_OSMO_INC

META_TELEPHONY_OSMO_INC functions as kind of a reverse dependency,
packages using libosmocore will now rebuild and link to the newer
soversion of the libraries. Upgrade OpenBSC due an ABI change in
the GPRS/GB code.
diff --git a/recipes-osmocom/openbsc/openbsc_git.bb b/recipes-osmocom/openbsc/openbsc_git.bb
index e661f9c..7b20795 100644
--- a/recipes-osmocom/openbsc/openbsc_git.bb
+++ b/recipes-osmocom/openbsc/openbsc_git.bb
@@ -1,9 +1,9 @@
 require ${PN}.inc
 
 PV = "0.12.0+gitr${SRCPV}"
-PR = "${INC_PR}.1"
+PR = "${INC_PR}.2"
 
-SRCREV = "019f913ca383bda9256e273c06327041b1761330"
+SRCREV = "df49a983e2523b94bb62fec3076259355fe0b52b"
 SRC_URI += "git://git.osmocom.org/openbsc.git;protocol=git"
 
 S = "${WORKDIR}/git/openbsc"