[Modules] Make test from r285377 darwin specific
[Modules] Make test from r285377 darwin specific

Appease buildbots:
http://bb.pgr.jp/builders/cmake-clang-x86_64-linux/builds/55876

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@285378 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang