Neither MinGW's nor Microsoft's <windows.h> includes <stddef.h>, either
directly or indirectly. Also, unlike GCC, Clang's <inttypes.h> does not
include <stddef.h>, either. "vkd3d_windows.h" does include <stddef.h>,
and this is why building for the host works, even with Clang.
Fixes cross compilation errors with Clang related to using offsetof(3).
Signed-off-by: Chip Davis <cdavis@codeweavers.com>
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>