Fixes for ADPCM decoding.

[David D. Hagood]

I found a bug in the decoding of the ADPCM data - the nybbles in the 
samples were being processed backwards - MSN then LSN (bits 4-7, then 
0-3), rather than LSN then MSN. Since ADPCM re-syncs every 8 samples, 
the audio was distorted but intelligable. With this fix, the audio is 
correct. I've tested this patch with Delorme's AAA MapNGo 4.0, which 
uses ADPCM for its audio files.

NOTE: I didn't check the encoding routines, nor did I check the MSADPCM 
files to see if they were correct.

Changelog:
ADPCM nybble processing order was incorrect.
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Index: dlls/msacm/imaadp32/imaadp32.c
===================================================================
RCS file: /home/wine/wine/dlls/msacm/imaadp32/imaadp32.c,v
retrieving revision 1.5
diff -r1.5 imaadp32.c
287c287
<                 process_nibble(*src >> 4, &stepIndexL, &sampleL);
---
>                 process_nibble(*src, &stepIndexL, &sampleL);
289c289
<                 process_nibble(*src++, &stepIndexL, &sampleL);
---
>                 process_nibble(*src++ >> 4, &stepIndexL, &sampleL);
294c294
<                 process_nibble(*src >> 4, &stepIndexR, &sampleR);
---
>                 process_nibble(*src , &stepIndexR, &sampleR);
296c296
<                 process_nibble(*src++, &stepIndexR, &sampleR);
---
>                 process_nibble(*src++ >>4, &stepIndexR, &sampleR);
338c338
<             process_nibble(*src >> 4, &stepIndex, &sample);
---
>             process_nibble(*src, &stepIndex, &sample);
340c340
<             process_nibble(*src++, &stepIndex, &sample);
---
>             process_nibble(*src++ >> 4, &stepIndex, &sample);