Small fixes to setting Windows file permissions#31892

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pitdicker wants to merge 5 commits intorust-lang:masterfrom

pitdicker:readonly_perm

Commits on Feb 20, 2016

Merge remote-tracking branch 'refs/remotes/rust-lang/master'
pitdicker
committed

Commits on Feb 21, 2016

Merge remote-tracking branch 'refs/remotes/rust-lang/master'
pitdicker
committed

Commits on Feb 25, 2016

Commits on Feb 26, 2016

Handle removing read-only from directories
pitdicker
committed