[CMake] Add -stdlib=libc++ to host Clang build flags before performing any header search
If LLVM_ENABLE_LIBCXX is specified, we should append -stdlib=libc++ to build
flags as early as possible, in particular, before we check for header presence
(as -stdlib=libc++ modifies header lookup rules). Otherwise we can find a header
at configure time (w/o -stdlib=libc++) but fail to find it at build time
(with -stdlib=libc++). See PR18569 for more details.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200744
91177308-0d34-0410-b5e6-
96231b3b80d8