Fix handling of doc_auto_cfg feature for cfg attributes on glob reexport

Author: GuillaumeGomez

src/librustdoc/clean/mod.rs

@@ -2722,7 +2722,7 @@ fn add_without_unwanted_attributes<'hir>(
                     if ident == sym::doc {
                         filter_doc_attr(normal, is_inline);
                         attrs.push((Cow::Owned(attr), import_parent));
-                    } else if ident != sym::cfg {
+                    } else if is_inline || ident != sym::cfg {
                         // If it's not a `cfg()` attribute, we keep it.
                         attrs.push((Cow::Owned(attr), import_parent));
                     }