Add src/node/* code to node:: namespace

src/rpc/mining.cpp

@@ -41,6 +41,13 @@
 #include <memory>
 #include <stdint.h>
 
+using node::BlockAssembler;
+using node::CBlockTemplate;
+using node::IncrementExtraNonce;
+using node::NodeContext;
+using node::RegenerateCommitments;
+using node::UpdateTime;
+
 /**
  * Return average network hashes per second based on the last 'lookup' blocks,
  * or from the last difficulty change if 'lookup' is nonpositive.