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setup-cross-toolchain-action sets
BUILD_STD=-Zbuild-std
environment variable and installsrust-src
component if the target is tier 3 and build-std is needed.docs: https://github.com/taiki-e/setup-cross-toolchain-action#example-workflow-tier-3-targets
(This environment variable has existed since the initial version of setup-cross-toolchain-action but I forgot to document it for a long time.)