Added stub for WMMMIDIRUNONCE called by midimap.drv.

if1632/mmsystem.spec

@@ -6,7 +6,7 @@ type	win16
 3      pascal  PlaySound(ptr word long) PlaySound16
 5      pascal  mmsystemGetVersion() mmsystemGetVersion16
 6      pascal  DriverProc(long word word long long) DriverProc16
-8      stub    WMMMIDIRUNONCE
+8      pascal  WMMMIDIRUNONCE() WMMMidiRunOnce16
 30     pascal16 OutputDebugStr(str) OutputDebugString16
 31     pascal  DriverCallback(long word word word long long long) DriverCallback16
 32     pascal  StackEnter() StackEnterLeave16

multimedia/mmsystem.c

@@ -5044,3 +5044,11 @@ void	WINAPI	StackEnterLeave16(void)
     __asm__("stc");
 #endif
 }
+
+/**************************************************************************
+ * 			WMMMIDIRUNONCE 	[MMSYSTEM.8]
+ */
+void WINAPI WMMMidiRunOnce16(void)
+{
+	FIXME("(), stub!\n");
+}