[Bug libstdc++/60326] Incorrect type from std::make_unsigned

[kristian.spangsege at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60326

--- Comment #1 from Kristian Spangsege <kristian.spangsege at gmail dot com> ---
Oops, should have been:

Clang 3.4 with `libc++` does this on x86_64:

std::make_signed<wchar_t>::type --> int 
std::make_unsigned<wchar_t>::type --> unsigned