move openbsc.pc to osmo-sgsn.pc

Change-Id: Iad28d85b2a6d175cbe5d506aa82e7e4d94111eff
diff --git a/osmo-sgsn.pc.in b/osmo-sgsn.pc.in
new file mode 100644
index 0000000..45aef57
--- /dev/null
+++ b/osmo-sgsn.pc.in
@@ -0,0 +1,10 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@/
+
+Name: OsmoSGSN
+Description: Osmocom's Serving GPRS Support Node for 2G and 3G packet-switched mobile networks
+Requires:
+Version: @VERSION@
+Cflags: -I${includedir}