Fix tests build for Emscripten.

GitOrigin-RevId: 7dec0a02befeb55379f39f1644cf64077db27ed7

test/main.cpp

@@ -30,7 +30,7 @@ int main(int argc, char **argv) {
   }
 #if TD_EMSCRIPTEN
   emscripten_set_main_loop(
-      [] {
+      [&runner] {
         if (!runner.run_all_step()) {
           emscripten_cancel_main_loop();
         }

test/tdclient.cpp

@@ -874,6 +874,7 @@ TEST(Client, SimpleMulti) {
   }
 }
 
+#if !TD_THREAD_UNSUPPORTED
 TEST(Client, Multi) {
   std::vector<td::thread> threads;
   for (int i = 0; i < 4; i++) {
@@ -895,6 +896,7 @@ TEST(Client, Multi) {
     thread.join();
   }
 }
+#endif
 
 TEST(PartsManager, hands) {
   //Status init(int64 size, int64 expected_size, bool is_size_final, size_t part_size,