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Rust 1.75 requires setting newer MACOSX_DEPLOYMENT_TARGET

With the release of rust 1.75, we now require setting the minimal MACOSX_DEPLOYMENT_TARGET to at least 10.12. You can do this by appending recipe/conda_build_config.yaml with the following content:

- '10.12' # [osx and x86]

You should also add a run dependency on the respective OSX version:

- __osx >={{ MACOSX_DEPLOYMENT_TARGET|default("10.9") }} # [osx and x86_64]

The latter is also set automatically via a run_exports of the compiler('rust') package, but we add this line if you would increase the deployment target later in the feedstock for unrelated reasons.