[libcxx] Fix the binder deprecation tests on Clang 5.

Tested on Docker containers with Clang 4, 5 and 6.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@342855 91177308-0d34-0410-b5e6-96231b3b80d8
11 files changed