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Emit warning on env variable case mismatch When running a command like `cargo --target TRIPPLE` cargo expects to find the environment variable CARGO_TARGET_[TRIPPLE]_* with uppercase and underscores. This check emits a warning if the checked environment variable has a mismatching case and/or contains dashes rather than underscores. The warning contains the given env variable as well as an explanation for the cause of the warning. The check is skipped on windows as environment variables are treated as case insensitive on the platform. Fixes #8285