From: bors <bors@rust-lang.org>
Date: Sun, 29 Oct 2017 16:39:30 +0000 (+0000)
Subject: Auto merge of #4672 - kennytm:fix-4671, r=alexcrichton
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Auto merge of #4672 - kennytm:fix-4671, r=alexcrichton

When uplifting directories, symlink them instead of hard-link them.

Fixes #4671.
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859c2305b5d7ff820d7f7af158bbca999cbd8bf3