Some Windows types, such as TCHAR, LPTSTR, LPCTSTR, are defined
differently if the application defines the macro UNICODE.
Reported by Steve Lhomme <robux4@ycbcr.xyz> in
<https://lists.gnu.org/archive/html/bug-gnulib/2020-05/msg00184.html>.
* lib/link.c (CreateHardLinkFuncType): Use LPCSTR, not LPCTSTR.
* lib/localename.c (enum_locales_fn): Use LPSTR, not LPTSTR.
* lib/stat-w32.c (GetFinalPathNameByHandleFuncType): Likewise.