[Issue 161] gdc and make -j2+ don't get along

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=161

--- Comment #4 from Dlang Bot <dlang-bot at dlang.rocks> ---
vibe-d/vibe-core pull request #162 "Fix Task.join() for multiple callers. Fixes
#161." was merged into master:

- 41c18aef743cdca2e0538c4ce804f21bd632a81c by Sönke Ludwig:
  Add test for issue #161.

https://github.com/vibe-d/vibe-core/pull/162

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