utils/Makefile.am: remove unused LIBOSMOVTY_CFLAGS

Change-Id: Id1152b105bb7364a06d9720829d39f587242b707
diff --git a/openbsc/src/utils/Makefile.am b/openbsc/src/utils/Makefile.am
index 0dbb85c..7fcc4e3 100644
--- a/openbsc/src/utils/Makefile.am
+++ b/openbsc/src/utils/Makefile.am
@@ -8,7 +8,6 @@
 	-Wall \
 	$(LIBOSMOCORE_CFLAGS) \
 	$(LIBOSMOGSM_CFLAGS) \
-	$(LIBOSMOVTY_CFLAGS) \
 	$(LIBOSMOABIS_CFLAGS) \
 	$(COVERAGE_CFLAGS) \
 	$(SQLITE3_CFLAGS) \