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This resolves a minor issue where build scripts could've acquired more job server tokens from Cargo than allowed by
-j
parameter. I've filled a PR at rust-lang/cc-rs#878 and we've iterated on the design over there since.TL;DR: some build scripts may complete a tad bit quicker, potentially shaving off a few seconds off of debug/release builds. Full description of the issue is available in rust-lang/cc-rs#858
Release Notes: