Support linux-riscv64 platform

[regro-cf-autotick-bot]

This feedstock is being rebuilt as part of the linux riscv64 migration.

Feel free to merge the PR if CI is all green, but please don't close it
without reaching out the the linux-riscv64 team first at @conda-forge/help-riscv64.

If this PR was opened in error or needs to be updated please add the bot-rerun label to this PR. The bot will close this PR and schedule another one. If you do not have permissions to add this label, you can use the phrase @conda-forge-admin, please rerun bot in a PR comment to have the conda-forge-admin add it for you.

_{This PR was created by the conda-forge-bot. The conda-forge-bot is a service to automatically track the dependency graph, migrate packages, and propose package version updates for conda-forge. Feel free to drop us a line if there are any issues! This PR was generated by https://github.com/conda-forge/conda-forge-bot/actions/runs/30971953289 - please use this URL for debugging.}

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/recipe.yaml) and found it was in an excellent condition.

[luhenry]

Depends on conda-forge/rust-feedstock#297 and conda-forge/rust-activation-feedstock#104

[regro-cf-autotick-bot]

I see that this PR has conflicts, and I'm the only committer. I'm going to close this PR and will make another one as appropriate. You should expect to wait at least a few hours, or possibly much longer, for a new PR.

_{This was generated by https://github.com/conda-forge/conda-forge-bot/actions/runs/31612986110 - please use this URL for debugging.}