libwebsocket: add missing $webSockets dependency (#26318)

`emscripten_websocket_new` uses `$webSockets` but does not declare it as
a dependency.

Fixes: #26310

Author: subhaushsingh

src/lib/libwebsocket.js

@@ -276,6 +276,7 @@ var LibraryWebSocket = {
   },
 
   emscripten_websocket_new__proxy: 'sync',
+  emscripten_websocket_new__deps: ['$webSockets'],
   emscripten_websocket_new: (createAttributes) => {
     if (!globalThis.WebSocket) {
 #if WEBSOCKET_DEBUG

test/test_sockets.py

@@ -395,6 +395,9 @@ def test_websocket_send(self, args):
     with NodeJsWebSocketEchoServerProcess():
       self.btest_exit('websocket/test_websocket_send.c', cflags=['-lwebsocket', '-sNO_EXIT_RUNTIME', '-sWEBSOCKET_DEBUG'] + args)
 
+  def test_websocket_new(self):
+    self.btest_exit('websocket/test_websocket_new.c', cflags=['-lwebsocket'])
+
   # Test that native POSIX sockets API can be used by proxying calls to an intermediate WebSockets
   # -> POSIX sockets bridge server
   @requires_shared_array_buffer

test/websocket/test_websocket_new.c

@@ -0,0 +1,14 @@
+#include <emscripten/websocket.h>
+#include <assert.h>
+
+int main() {
+  EMSCRIPTEN_WEBSOCKET_T s =
+    emscripten_websocket_new(&(EmscriptenWebSocketCreateAttributes){
+      .url = "ws://localhost:9000",
+      .protocols = "text",
+    });
+
+  assert(s > 0);
+
+  return 0;
+}