Replace fcntl-based file lock with flock#72161

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bors merged 3 commits intorust-lang:masterfrom

nbdd0121:master

May 22, 2020

Commits on May 13, 2020

Replace fcntl-based file lock with flock
nbdd0121
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Commits on May 20, 2020

Use fcntl-based file lock for non-Linux unix
nbdd0121
committed

Commits on May 21, 2020

Comment flock usage on Linux
nbdd0121
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