debian: .install: split mgcp-client out of legacy-mgcp

Change-Id: I681e9a1299607ff3a30de34c043da499c471bc31
diff --git a/debian/libosmo-mgcp-client1.install b/debian/libosmo-mgcp-client1.install
new file mode 100644
index 0000000..4fc8bc6
--- /dev/null
+++ b/debian/libosmo-mgcp-client1.install
@@ -0,0 +1 @@
+usr/lib/*/*mgcp-client*.so.*