Fix flaky wasm2js1.test_pthread_c11_threads test

By printing before reporting the result.

Author: kleisauke

tests/pthread/test_pthread_c11_threads.c

@@ -95,10 +95,9 @@ int main(int argc, char* argv[]) {
   assert(thrd_create(&t6, thread_main, NULL) == thrd_success);
   assert(thrd_detach(t6) == thrd_success);
 
-
+  printf("done!\n");
 #ifdef REPORT_RESULT
   REPORT_RESULT(0);
 #endif
-  printf("done!\n");
   return 0;
 }