Clean up external Rust crates.

All we need on master-art have been migrated to a monorepo
(b/339424309).

Also remove prebuilts/bazel/darwin-x86_64, which is no longer used on
main.

Test: repo sync && art/tools/buildbot-build.sh
Change-Id: I917f50c991853abf8732e64f35cf14f531a29a88
1 file changed
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