Skip test_pthread_proxying_cpp with wasm2js (#16570)

See #16569.

Author: tlively

tests/test_core.py

@@ -2579,6 +2579,7 @@ def test_pthread_proxying(self):
                                  emcc_args=args, interleaved_output=False)
 
   @node_pthreads
+  @no_wasm2js('occasionally hangs in wasm2js (#16569)')
   def test_pthread_proxying_cpp(self):
     self.set_setting('EXIT_RUNTIME')
     self.set_setting('PROXY_TO_PTHREAD')