update cfg(bootstrap)

library/std/src/lib.rs

@@ -274,7 +274,6 @@
 // tidy-alphabetical-start
 
 // stabilization was reverted after it hit beta
-#![cfg_attr(not(bootstrap), feature(extended_varargs_abi_support))]
 #![feature(alloc_error_handler)]
 #![feature(allocator_internals)]
 #![feature(allow_internal_unsafe)]
@@ -292,6 +291,7 @@
 #![feature(doc_masked)]
 #![feature(doc_notable_trait)]
 #![feature(dropck_eyepatch)]
+#![feature(extended_varargs_abi_support)]
 #![feature(f128)]
 #![feature(f16)]
 #![feature(formatting_options)]