Avoid unnecessary main browser check. NFC.

emscripten_check_blocking_allowed will do this for us.

Author: kleisauke

system/lib/libc/musl/src/thread/pthread_cond_timedwait.c

@@ -77,9 +77,7 @@ int __pthread_cond_timedwait(pthread_cond_t *restrict c, pthread_mutex_t *restri
 
 #ifdef __EMSCRIPTEN__
 	// TODO: Optimize this away in MINIMAL_RUNTIME.
-	if (pthread_self() == emscripten_main_browser_thread_id()) {
-		emscripten_check_blocking_allowed();
-	}
+	emscripten_check_blocking_allowed();
 #endif
 
 	if ((m->_m_type&15) && (m->_m_lock&INT_MAX) != __pthread_self()->tid)