Add empty libcommon-cs

This will gradually soak up code shared by libbsc and libmsc.

Change-Id: If34e2bd38a099d0799238337468d56e0305ab8ae
diff --git a/openbsc/src/libcommon-cs/Makefile.am b/openbsc/src/libcommon-cs/Makefile.am
new file mode 100644
index 0000000..f3921ba
--- /dev/null
+++ b/openbsc/src/libcommon-cs/Makefile.am
@@ -0,0 +1,20 @@
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
+
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(NULL)
+
+noinst_LIBRARIES = libcommon-cs.a
+
+libcommon_cs_a_SOURCES = \
+	common_cs.c \
+	common_cs_vty.c