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Inform dep-info users about used environment variables #40364

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@alexcrichton

It'd be great for caching servers like sccache if the compiler could inform them about used environment variables for the compilation through macros like env! and option_env!. I'm not precisely sure what the format would look like, but via some means would be great!

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    C-feature-requestCategory: A feature request, i.e: not implemented / a PR.

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