Reland "rust: fix some tricium warnings in 1.47.0 ebuild"

Original Change-Id: I3bb51c3128e332db1878fef5e937635082cbdeb6

Relanding because this was landed with a broken readline upgrade that
couldn't be deployed, so this had to be reverted.

BUG=None
TEST=sudo emerge virtual/rust

Change-Id: I72e755e5bd3b8a12eb6fa1a60e3b25918d715021
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2535673
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
2 files changed