Emit a warning when linking with -sEXPORT_NAME=config

Author: kleisauke

emcc.py

@@ -3767,7 +3767,10 @@ def modularize():
   if not settings.EXPORT_READY_PROMISE:
     return_value = '{}'
 
-  # FIXME: https://bugs.webkit.org/show_bug.cgi?id=223533
+  # TODO: Remove when https://bugs.webkit.org/show_bug.cgi?id=223533 is resolved.
+  if async_emit != '' and settings.EXPORT_NAME == 'config':
+    diagnostics.warning('emcc', 'EXPORT_NAME should not be named "config" when targeting Safari')
+
   src = '''
 %(maybe_async)sfunction(config) {
   var %(EXPORT_NAME)s = config || {};