Add compile flag to disable compilation of mining code

src/metrics.cpp

@@ -128,6 +128,7 @@ int printNetworkStats()
 
 int printMiningStatus(bool mining)
 {
+#ifdef ENABLE_MINING
     // Number of lines that are always displayed
     int lines = 1;
 
@@ -151,6 +152,9 @@ int printMiningStatus(bool mining)
     std::cout << std::endl;
 
     return lines;
+#else // ENABLE_MINING
+    return 0;
+#endif // !ENABLE_MINING
 }
 
 int printMetrics(size_t cols, bool mining)
@@ -342,7 +346,11 @@ void ThreadShowMetricsScreen()
         }
 
         // Miner status
+#ifdef ENABLE_MINING
         bool mining = GetBoolArg("-gen", false);
+#else
+        bool mining = false;
+#endif
 
         if (loaded) {
             lines += printNetworkStats();