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Forbid setting `RUSTC_BOOTSTRAP` from a build script on stable Instead, recommend `RUSTC_BOOTSTRAP=crate_name`. If cargo is using a nightly toolchain, or if RUSTC_BOOTSTRAP was set in *cargo*'s build environment, the error is downgraded to a warning, since the variable won't affect the build. This is mostly the same as suggested in https://github.com/rust-lang/cargo/issues/7088#issuecomment-713867773, except that `RUSTC_BOOTSTRAP=` values other than 1 are treated the same as `RUSTC_BOOTSTRAP=1`. My reasoning was that https://github.com/rust-lang/rust/pull/77802 is now on 1.50 stable, so some crates may have started using it, and I would still prefer not to give hard errors when there's no workaround. Closes https://github.com/rust-lang/cargo/issues/7088. r? `@joshtriplett`