added closing brace for extern "C" in websocket.h (#8468)

AUTHORS

@@ -399,3 +399,4 @@ a license to everyone to use it as detailed in LICENSE.)
 * Timothy Trindle <titrindl@microsoft.com> (copyright owned by Microsoft, Inc.)
 * Matthew Andres Moreno <m.more500@gmail.com>
 * Eric Mandel <eric@cfa.harvard.edu>
+* Amir Rasouli <arasouli91@gmail.com>

system/include/emscripten/websocket.h

@@ -113,3 +113,7 @@ EMSCRIPTEN_RESULT emscripten_websocket_delete(EMSCRIPTEN_WEBSOCKET_T socket);
 // even after the pthread quits, although be warned that if the target thread that was registered to handle events for a given WebSocket quits, then those
 // events will stop from being delivered altogether.
 void emscripten_websocket_deinitialize(void);
+  
+#ifdef __cplusplus
+} // ~extern "C"
+#endif