tests: re-enable refactoring for zstd

Author: kkysen

tests/zstd/conf.yml

@@ -11,8 +11,7 @@ transpile:
   tflags: --reorganize-definitions --disable-refactoring
 
 refactor:
-  # TODO: re-enable once c2rust-refactor supports asm!
-  # autogen: true
+  autogen: true
   transforms:
     - rename_unnamed
     - reorganize_definitions