configure.ac: Remove ibosmo-sccp dependency

osmo-msc had probably forever contained a configure.ac dependency
to libosmo-sccp (that's the old static library libsccp.a), which was
only added to use a single header file (sccp_types.h).  This file
has recently been migrated to libosmo-sigtran, as libsccp.a
has been removed.

Change-Id: Ifcdad8684614c95982b6b471a5585dd42a7fb897
diff --git a/src/utils/Makefile.am b/src/utils/Makefile.am
index 6069672..335c950 100644
--- a/src/utils/Makefile.am
+++ b/src/utils/Makefile.am
@@ -34,7 +34,7 @@
 
 smpp_mirror_CFLAGS = \
 	$(LIBOSMOCORE_CFLAGS) \
-	$(LIBOSMOSCCP_CFLAGS) \
+	$(LIBOSMOSIGTRAN_CFLAGS) \
 	$(LIBOSMOMGCPCLIENT_CFLAGS) \
 	$(LIBSMPP34_CFLAGS) \
 	$(NULL)