[PATCH 4/4 try2] dsound: Resample to float, not device format

[Andrew Eikum]

Before this patch, the chain is
secondary format
 =(Resample)=> float
 =(Reformat)=> device format
 =(Volume)=> device format
 =(Mix)=> float
 =(Reformat)=> device format

Now it's
secondary format
 =(Resample)=> float
 =(Volume)=> float
 =(Mix)=> float
 =(Reformat)=> device format

This lets us remove the 'mixfunction' pointer.
---

try2: Add Volume step to comment, as requested by Alexander Patrakov

 dlls/dsound/dsound_convert.c |   92 +++-----------------------------
 dlls/dsound/dsound_private.h |    9 ++--
 dlls/dsound/mixer.c          |  118 ++++++++++++++++--------------------------
 dlls/dsound/primary.c        |   15 ++----
 4 files changed, 59 insertions(+), 175 deletions(-)

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