openbsc: enable smpp

libsmpp34 was listed in DEPENDS but it's use was not enabled.

Change-Id: I20c77346e4894d6d146863fd79f6d27ef12cb3ee
diff --git a/recipes-osmocom/openbsc/openbsc.inc b/recipes-osmocom/openbsc/openbsc.inc
index 3c1b98f..90a0398 100644
--- a/recipes-osmocom/openbsc/openbsc.inc
+++ b/recipes-osmocom/openbsc/openbsc.inc
@@ -11,10 +11,10 @@
 	   file://osmo-bsc-sccplite.service \
 	   "
 
-INC_PR = "r24.${META_TELEPHONY_OSMO_INC}"
+INC_PR = "r25.${META_TELEPHONY_OSMO_INC}"
 
 
-EXTRA_OECONF += "--enable-osmo-bsc --enable-mgcp-transcoding --with-g729"
+EXTRA_OECONF += "--enable-osmo-bsc --enable-smpp --enable-mgcp-transcoding --with-g729"
 
 inherit autotools update-rc.d pkgconfig