move OAP messages implementations to libosmocore

This corresponds to change-id If5099e60681a215e798b6675f21813f26769c253 in
libosmocore, which is now required to build openbsc.

Related: OS#1592
Change-Id: I2f06aaa6eb54eafa860cfed8e72e41d82ff1c4cf
diff --git a/openbsc/configure.ac b/openbsc/configure.ac
index 4fe1050..0753834 100644
--- a/openbsc/configure.ac
+++ b/openbsc/configure.ac
@@ -33,7 +33,7 @@
 PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore >= 0.9.5)
 PKG_CHECK_MODULES(LIBOSMOVTY, libosmovty >= 0.3.0)
 PKG_CHECK_MODULES(LIBOSMOCTRL, libosmoctrl)
-PKG_CHECK_MODULES(LIBOSMOGSM, libosmogsm >= 0.9.4)
+PKG_CHECK_MODULES(LIBOSMOGSM, libosmogsm >= 0.9.5)
 PKG_CHECK_MODULES(LIBOSMOABIS, libosmoabis >= 0.2.0)
 PKG_CHECK_MODULES(LIBOSMOGB, libosmogb >= 0.6.4)
 PKG_CHECK_MODULES(LIBOSMONETIF, libosmo-netif >= 0.0.1)