Don't use an empty RUSTC_WRAPPER#5985
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Don't use an empty RUSTC_WRAPPER Fixes #5588
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Make the empty rustc-wrapper test more explicit. This changes the test for an empty RUSTC_WRAPPER environment variable to make it explicit that it doesn't just ignore the environment variable, but that it also essentially unsets any config-loaded value. It's not clear if this implication was known at the time it was added in #5985, but I don't think we can change it, and it can be useful.
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Fixes #5588