Move windows socket init to utility function

src/bitcoin-cli.cpp

@@ -303,6 +303,10 @@ int CommandLineRPC(int argc, char *argv[])
 int main(int argc, char* argv[])
 {
     SetupEnvironment();
+    if (!SetupNetworking()) {
+        fprintf(stderr, "Error: Initializing networking failed\n");
+        exit(1);
+    }
 
     try {
         if(!AppInitRPC(argc, argv))