Move pthread_join builtin to JS

Author: kleisauke

src/library_pthread.js

@@ -835,6 +835,10 @@ var LibraryPThread = {
 #endif
   },
 
+#if USE_LSAN
+  emscripten_builtin_pthread_join: 'pthread_join',
+#endif
+
   pthread_kill__deps: ['$killThread', '$cancelThread', 'emscripten_main_browser_thread_id'],
   pthread_kill: function(thread, signal) {
     if (signal < 0 || signal >= 65/*_NSIG*/) return ERRNO_CODES.EINVAL;

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

@@ -60,7 +60,3 @@ static int __pthread_tryjoin_np(pthread_t t, void **res)
 weak_alias(__pthread_tryjoin_np, pthread_tryjoin_np);
 weak_alias(__pthread_timedjoin_np, pthread_timedjoin_np);
 weak_alias(__pthread_join, pthread_join);
-
-#ifdef __EMSCRIPTEN__ // XXX Emscripten needed by LSan
-weak_alias(__pthread_join, emscripten_builtin_pthread_join);
-#endif