rustbuild: print out env vars on verbose rustc invocations#82403

Merged

bors merged 1 commit intorust-lang:masterfrom pnkfelix:rustbuild-emit-env-vars-on-verbose-verbose

Mar 1, 2021

Commits on Feb 22, 2021

Print out env vars related to Rust on (sufficiently verbose) rustc invocations.
pnkfelix
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