stdlib: Clean up Ruby cache directory

- Fix typos.
- Fix type inconsistencies.

Change-Id: I98d82ec7e62130abb09295c5ec6cde86b1f7fa27
Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/65571
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
2 files changed