Made mmioSetBuffer callable from 16 and 32 bit code.

diff --git a/include/mmsystem.h b/include/mmsystem.h
index a1d7e67..fde6eed 100644
--- a/include/mmsystem.h
+++ b/include/mmsystem.h
@@ -1624,7 +1624,9 @@
 MMRESULT32 WINAPI	mmioSetInfo32(HMMIO32,const MMIOINFO32*,UINT32);
 #define			mmioSetInfo WINELIB_NAME(mmioSetInfo)
 
-UINT16 WINAPI	mmioSetBuffer(HMMIO16,LPSTR,LONG,UINT16);
+UINT16 WINAPI	mmioSetBuffer16(HMMIO16,LPSTR,LONG,UINT16);
+UINT32 WINAPI	mmioSetBuffer32(HMMIO32,LPSTR,LONG,UINT32);
+#define			mmioSetBuffer WINELIB_NAME(mmioSetInfo)
 
 UINT16 WINAPI	mmioFlush16(HMMIO16,UINT16);
 UINT32 WINAPI	mmioFlush32(HMMIO32,UINT32);