Merge pull request #12891 from fusijie/refine_HttpAsynConnection

refine NSLog in HttpAsynConnection in release mode.

cocos/network/HttpAsynConnection.m

@@ -61,7 +61,10 @@
 
 - (void) startRequest:(NSURLRequest *)request
 {
+#ifdef COCOS2D_DEBUG
     NSLog(@"Starting to load %@", srcURL);
+#endif
+    
     finish = false;
 
     self.responseData = [NSMutableData data];
@@ -90,7 +93,9 @@
  **/
 - (void) connection:(NSURLConnection *)connection 
  didReceiveResponse:(NSURLResponse *)response {
+#ifdef COCOS2D_DEBUG
     NSLog(@"Received response from request to url %@", srcURL);
+#endif
     
     NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
     //NSLog(@"All headers = %@", [httpResponse allHeaderFields]);