The stream pointer was used as the DWORD id, which is only going to
work on 32bit. It may very well be that winmm is only used in 32bit,
but then we still build a 64bit version of it.
Signed-off-by: Rémi Bernon <rbernon@codeweavers.com>
Signed-off-by: Andrew Eikum <aeikum@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>