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devaudio: implement volume setting for win32 (thanks jsmoody)

--- a/kern/devaudio-win32.c

+++ b/kern/devaudio-win32.c

@@ -52,19 +52,24 @@

 void

 audiodevsetvol(int what, int left, int right)

 {

-	USED(what);

-	USED(left);

-	USED(right);

-	error("not supported");

+	DWORD v;

+

+	//Windows uses a 0-255 scale, plan9 uses 0-100

+	v = right*0xFF/100;

+	v = (v<<8)|left*0xFF/100;

+	if(waveOutSetVolume(waveout, v) != MMSYSERR_NOERROR)

+		oserror();

 }

 void

 audiodevgetvol(int what, int *left, int *right)

 {

-	USED(what);

-	USED(left);

-	USED(right);

-	error("not supported");

+	DWORD v;

+

+	if(waveOutGetVolume(waveout, &v) != MMSYSERR_NOERROR)

+		oserror();

+	*left = (v&0xFF)*100/0xFF;

+	*right = ((v>>8)&0xFF)*100/0xFF;

 }

 int