CBSP: add local bind to client mode

Add the ability to set a local bind address for the CBSP client mode.

Change-Id: I56a420d204a9a487b27dd460f4cc52e0b4093d69
diff --git a/include/osmocom/bsc/smscb.h b/include/osmocom/bsc/smscb.h
index c7002f6..f48c1a1 100644
--- a/include/osmocom/bsc/smscb.h
+++ b/include/osmocom/bsc/smscb.h
@@ -55,6 +55,7 @@
 	/* for handling outbound TCP connections */
 	struct {
 		struct osmo_sockaddr_str remote_addr;
+		struct osmo_sockaddr_str local_addr;
 		struct osmo_stream_cli *cli;
 		char *sock_name;
 		struct msgb *msg;