Michael Wright 1ab96db791 Make dogfood test output to seperate directory
This commit makes `cargo clippy` output the build artifacts to a
separate directory if the `CLIPPY_DOGFOOD` env var is set. This should
prevent dogfood builds from interfering with regular builds.

This should help with issue #2595.
2018-04-01 09:44:30 +02:00
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