split off osmo-mgw: remove files, apply build, rename

Add vty and logging previously used from libcommon

Rename libmgcp to libosmo-legacy-mgcp and install.

Use DLMGCP, not DMGCP.

Slim down the public mgcpgw_client API, move all elements not actually used by
current callers to private headers / static c.

Depends: libosmocore I09c587e2d59472cbde852d467d457254746d9e67
Change-Id: I71a0a16ebaaef881c34235849601fc40aa12cfd7
diff --git a/libosmo-legacy-mgcp.pc.in b/libosmo-legacy-mgcp.pc.in
new file mode 100644
index 0000000..62d9edc
--- /dev/null
+++ b/libosmo-legacy-mgcp.pc.in
@@ -0,0 +1,10 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: Osmocom legacy Media Gateway Control Protocol library
+Description: C Utility Library
+Version: @VERSION@
+Libs: -L${libdir} -losmo-legacy-mgcp
+Cflags: -I${includedir}/