message: wasm: provide working pthread_equal().
diff: @@ -580,11 +580,7 @@ Word ___syscall146Handler(void* raw_context, Word, Word syscall_args_ptr) {
  void ___setErrNoHandler(void*, Word) { throw WasmException("emscripten setErrNo"); }
  -// NB: pthread_equal is required to return 0 by the protobuf libarary.
  -Word _pthread_equalHandler(void*, Word,
  - Word) { /* throw WasmException("emscripten pthread_equal"); */
  - return 0;
  -}
  +Word _pthread_equalHandler(void*, Word left, Word right) { return left == right; }
  // NB: pthread_mutex_destroy is required to return 0 by the protobuf libarary.
  Word _pthread_mutex_destroyHandler(void*, Word) { return 0; }
  Word _pthread_cond_waitHandler(void*, Word, Word) {
  