Add __errno_location on Redox, DragonFlyBSD, Haiku#1432

Merged

bors merged 6 commits intorust-lang:masterfrom

Jul 15, 2019

Commits on Jul 12, 2019

Update documentation to point to Rust issue
josephlr
committed

Commits on Jul 15, 2019

Remove use of `unstable` feature
josephlr
committed

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