user32: In COMBO_WindowPosChanging() do not change the height of the the dropped rectangle, if the new height is too small.

winmm: SND_ALIAS and SND_ALIAS_ID overlap so when checking for SND_ALIAS_ID make sure it is SND_ALIAS_ID and not SND_ALIAS.

Prevents hanging in Outlook 2000 on sound cleanup.

Made several tests pass on NT4 (no SP), Vista and Win2k8.

This allows us to avoid comparing against WINED3DSIO_*, which is specific to
the bytecode.

num_params includes the destination parameter, while we're only interested in
source parameters. This doesn't cause problems for any of the instrctions
currently handled by shader_glsl_map2gl() though, since they all happen to
have at least 1 source parameter.

The "instr" parameter to shader_glsl_gen_modifier() is actually a source
parameter, so comparing against WINED3DSIO_TEXKILL is just silly.

Based on Aric's recent patch.

The callback is probably not fully compatible, but apps are not
supposed to use that function anyway.