Travis: Try other xcode image

.travis.yml

@@ -20,7 +20,7 @@ cache:
   directories:
   - $HOME/third-party
 
-osx_image: xcode8.3
+osx_image: xcode8
 
 addons:
   apt:

src/civetweb.c

@@ -16815,7 +16815,7 @@ worker_thread_run(struct worker_thread_args *thread_args)
 			           conn->dom_ctx->ssl_ctx,
 			           SSL_accept,
 			           &(conn->phys_ctx->stop_flag))) {
-				/* XXX TODO: Set conn->dom_ctx */
+                /* conn->dom_ctx is set in get_request */
 
 				/* Get SSL client certificate information (if set) */
 				ssl_get_client_cert_info(conn);