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`-Ztarget-applies-to-host --config target-applies-to-host=false` make it possible to build two units for the same output directory with different rustflags (one with artifact/target rustflags, one with none/host rust flags). Those flags aren't included in the `-Cmetadata` hash which is used to disambiguate different versions of crates, resulting in a conflict. The actual error being produced appears to be the result of two invocations of `rustc` racing and clobbering each other. While we don't hash RUSTFLAGS because it may contain absolute paths that hurts reproducibility, we track whether a unit's RUSTFLAGS is from host config, so that we can generate a different metadata hash for runtime and compile-time units.