bors 319f2dd9e1 Auto merge of #1279 - divergentdave:open_O_EXCL, r=RalfJung
Add support for OpenOptions::create_new()/O_EXCL

This PR extends the POSIX shim for `open` to support the `O_EXCL` flag, when it is used alongside `O_CREAT`, and exercises it by testing `OpenOptions::create_new`.
2020-03-30 15:49:45 +00:00
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