New issue by cinerea0 on void-packages repository

https://github.com/void-linux/void-packages/issues/34889

Description:
Some rust packages are currently failing to cross-build because they depend on indexmap. A default hash builder only exits for std builds; this is checked in indexmap's build.rs file, and that test is currently failing for us. We don't want to fix it with the environment variable because the autocfg tests should be working.

Packages that have been merged:
* delta (https://github.com/void-linux/void-packages/commit/a57464b5b5fb3d7629c8f70ca4125d390629c9c4)
* mdcat (https://github.com/void-linux/void-packages/commit/6f50eb3dae70699544b87edfe7eda0fe981b967b)
* tree-sitter (https://github.com/void-linux/void-packages/commit/6660537f754ddb0ca97c3b174425998bd796ca57)

Packages with open PRs:
* broot (https://github.com/void-linux/void-packages/pull/34854)
* rust-analyzer (https://github.com/void-linux/void-packages/pull/34856)
* starship (https://github.com/void-linux/void-packages/pull/34850)