Implement IuCS (large refactoring and addition)

osmo-nitb becomes osmo-msc
add DIUCS debug log constant
add iucs.[hc]
add msc vty, remove nitb vty
add libiudummy, to avoid linking Iu deps in tests
Use new msc_tx_dtap() instead of gsm0808_submit_dtap()
libmgcp: add mgcpgw client API
bridge calls via mgcpgw

Enable MSC specific CTRL commands, bsc_base_ctrl_cmds_install() still needs to
be split up.

Change-Id: I5b5b6a9678b458affa86800afb1ec726e66eed88
diff --git a/include/openbsc/gprs_gmm.h b/include/openbsc/gprs_gmm.h
index d210a35..c38e49f 100644
--- a/include/openbsc/gprs_gmm.h
+++ b/include/openbsc/gprs_gmm.h
@@ -30,6 +30,6 @@
 
 time_t gprs_max_time_to_idle(void);
 
-int iu_rab_act_ps(uint8_t rab_id, struct sgsn_pdp_ctx *pdp, bool use_x213_nsap);
+int iu_rab_act_ps(uint8_t rab_id, struct sgsn_pdp_ctx *pdp);
 
 #endif /* _GPRS_GMM_H */