Function mex_sys::mbstowcs_s

pub unsafe extern "C" fn mbstowcs_s(
    _PtNumOfCharConverted: *mut size_t, 
    _DstBuf: *mut wchar_t, 
    _SizeInWords: size_t, 
    _SrcBuf: *const c_char, 
    _MaxCount: size_t
) -> errno_t