Fixes to chunked support when pipelining

src/net.h

@@ -67,6 +67,7 @@ struct mg_connection {
   unsigned is_draining : 1;    // Send remaining data, then close and free
   unsigned is_closing : 1;     // Close and free the connection immediately
   unsigned is_full : 1;        // Stop reads, until cleared
+  unsigned is_resp : 1;        // Response is still being generated
   unsigned is_readable : 1;    // Connection is ready to read
   unsigned is_writable : 1;    // Connection is ready to write
 };