From: bors <bors@rust-lang.org>
Date: Thu, 1 Feb 2018 19:12:19 +0000 (+0000)
Subject: Auto merge of #4995 - alexcrichton:relative-env, r=matklad
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Auto merge of #4995 - alexcrichton:relative-env, r=matklad

Fix `RUSTC=./relative-path` when building

This commit adjusts the compiler location logic to resolve `./relative-path`
before invoking rustc to ensure it's no longer cwd-relative. This is how many
other variables like `CARGO_HOME` work, so it's applying similar logic.
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cd5b9802218311f1b5d9fbf6767582476c2bff7f