Auto merge of #3659 - nathanaeljones:master, r=alexcrichton

Fix #3658 .cargo/config prevents freshness (sort after HashMap)

The many vectors of BuildOutput are populated from a HashMap in cargo_compile... and later these vectors are hashed.

HashMaps are the bane of Cargo's existence.

But for now, we sort.

diff --cc tests/build-script.rs
Simple merge