Build fails for LLVM 19 / Windows

[MarcKamradt]

It seems the function

    template <size_t index, typename = void,
              KFR_ENABLE_IF(index < 1024 && !compound_type_traits<T>::is_scalar)>
    KFR_MEM_INTRINSIC constexpr void set(csize_t<index>, const value_type& s) CMT_NOEXCEPT
    {
        this->s[index] = s;
    }

does not compile with the latest LLVM. It looks like clang never evaluated it before because of the KFR_ENABLE_IF and they now have changed the behavior and the compilation fails.