Function mex_sys::wcstombs_s

pub unsafe extern "C" fn wcstombs_s(
    _PtNumOfCharConverted: *mut size_t, 
    _Dst: *mut c_char, 
    _DstSizeInBytes: size_t, 
    _Src: *const wchar_t, 
    _MaxCountInBytes: size_t
) -> errno_t