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devaudio-win32: dont burn cpu when wave block is busy

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

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

@@ -84,7 +84,7 @@

 	b = &blk[blkidx++ % nelem(blk)];

 	if(b->h.dwFlags & WHDR_PREPARED){

 		while(waveOutUnprepareHeader(waveout, &b->h, sizeof(b->h)) == WAVERR_STILLPLAYING)

-			osyield();

+			osmsleep(50);

 	}

 	memmove(b->s, v, n);

 	b->h.lpData = (void*)b->s;

--- a/kern/fns.h

+++ b/kern/fns.h

@@ -368,6 +368,7 @@

 void*		xspanalloc(ulong, int, ulong);

 void		xsummary(void);

 void		osyield(void);

+void		osmsleep(int);

 Segment*	data2txt(Segment*);

 Segment*	dupseg(Segment**, int, int);

 Segment*	newseg(int, ulong, ulong);