Partial fix for PR38964. (<string> can't be built with gcc -std=c++03) Reviewed as https://reviews.llvm.org/D52240

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@344616 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed