[clang-tidy] Fix for buildbot.

Summary:
Fix an issue for windows.

Differential Revision: https://reviews.llvm.org/D35372

Change-Id: Iab802cdec590fdde0b3c80cee19e2b35d35d3b85
git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@310669 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed