rpc: Register calls where they are defined

src/rest.cpp

@@ -272,6 +272,9 @@ static bool rest_block_notxdetails(HTTPRequest* req, const std::string& strURIPa
     return rest_block(req, strURIPart, false);
 }
 
+// A bit of a hack - dependency on a function defined in rpc/blockchain.cpp
+UniValue getblockchaininfo(const UniValue& params, bool fHelp);
+
 static bool rest_chaininfo(HTTPRequest* req, const std::string& strURIPart)
 {
     if (!CheckWarmup(req))