Add msc_vlr test suite for MSC+VLR end-to-end tests

Change-Id: If0e7cf20b9d1eac12126955b2f5f02bd8f1192cd
diff --git a/configure.ac b/configure.ac
index 2ca1ba3..e2bbf79 100644
--- a/configure.ac
+++ b/configure.ac
@@ -261,6 +261,7 @@
     tests/v42bis/Makefile
     tests/nanobts_omlattr/Makefile
     tests/sms_queue/Makefile
+    tests/msc_vlr/Makefile
     doc/Makefile
     doc/examples/Makefile
     contrib/Makefile