Source release v3.0.1 + third_party

cdm/cdm.gyp

@@ -32,6 +32,7 @@
     # Make sure that a valid config.h for your target is in the source tree.
     'protobuf_config%': 'source',
     'protobuf_source%': '../third_party/protobuf',
+    'protoc_host_target%': 'dummy',
   },  # variables
   'conditions': [
     ['protobuf_config=="source"', {
@@ -187,5 +188,9 @@
         ],
       },
     },
+    {
+      'target_name': 'dummy',
+      'type': 'none',
+    },
   ],
 }