Populate cargo env vars for crate_universe targets #3260
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This allows people to set all of the compile-time variables that would be set by Cargo. This doesn't currently wire up crate_universe to generate and depend on these targets for third-party crates, but I can add that if this PR looks good - it should just be a matter of a small addition to the generation templates (one new target, and setting `rustc_env_files` to point at the new target).
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Fixes #2677
Depends on #2772