Revert "Set RUSTC and RUSTDOC env for child processes run through the proxy" #3034
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Reverts #2958. This caused several issues related to nested cargo proxies calling one another; see #3031 and #3029.
I would like to re-land something like this in the future (#3035). But the issues are complicated to fix, and might require changes in the code that's calling nested proxies. This gets a patch release out in the meantime while we figure out the best approach.