Merging r351334:

Merging r351334:
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r351334 | ibiryukov | 2019-01-16 14:18:59 +0100 (Wed, 16 Jan 2019) | 8 lines

Set '-target' flag in the test checking the MacOS include dir

To fix a buildbot failure on PS4, see
http://lab.llvm.org:8011/builders/llvm-clang-lld-x86_64-scei-ps4-ubuntu-fast/builds/42251

The test was added in r351222 and aims to check only a particular
Mac configuration. However it relied on the default compiler target
by default, therefore unintentionally failing on PS4.
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_80@351343 91177308-0d34-0410-b5e6-96231b3b80d8