move to osmo-mgw.git: osmo-bsc_mgcp and libmgcp as libosmo-legacy-mgcp

Rewire build and includes to libosmo-legacy-mgcp.

Drop osmo-bsc_mgcp and related python tests, now found in osmo-mgw.git.

libosmo-legacy-mgcp is installed from osmo-mgw, hence add the dependency to
jenkins.sh (so far using the pre_release branch).

Change-Id: Ic99d681759edce11564da62500c2aac5cf5fffe2
diff --git a/src/osmo-msc/msc_main.c b/src/osmo-msc/msc_main.c
index de6af5d..30b11d9 100644
--- a/src/osmo-msc/msc_main.c
+++ b/src/osmo-msc/msc_main.c
@@ -64,7 +64,7 @@
 #include <openbsc/osmo_bsc_rf.h>
 #include <openbsc/smpp.h>
 #include <osmocom/sigtran/osmo_ss7.h>
-#include <openbsc/mgcpgw_client.h>
+#include <osmocom/legacy_mgcp/mgcpgw_client.h>
 
 #ifdef BUILD_IU
 #include <osmocom/ranap/iu_client.h>