Attempt to fix a buildbot that is using libc++ by default. <rdar://13302264>


git-svn-id: https://llvm.org/svn/llvm-project/test-suite/trunk@176194 91177308-0d34-0410-b5e6-96231b3b80d8
Further fixes for libc++. <rdar://problem/13302264>


git-svn-id: https://llvm.org/svn/llvm-project/test-suite/trunk@176196 91177308-0d34-0410-b5e6-96231b3b80d8