locale: update ctype access for MSVC CRT 14+
Visual C++ 14 and newer split msvcrt into msvcrt and ucrt with flavours
of the ucrt for different environments. This changed the access to the
ctype table by introducing the `__pctype_func` and `__pwctype_func`
accessors. Use this rather than directly accessing `_ctype` which
allows us to be safer in threaded situations by going through the libc
locking.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@290823 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed
