Fixed several bugs in the emulation of the National Semiconductors PC87306 Super I/O chip;

Attempt to fix sound fluttering in waiting for a better fix from mainline PCem;
Attempt to make the Sound Blaster louder;
Removed excess logging from cdrom_ioctl.c.

src/cdrom-ioctl.c

@@ -692,7 +692,7 @@ static int ioctl_media_type_id(uint8_t id)
 
 	SCSICommand(id, cdb, msbuf, &len, 1);
 
-	pclog("Returned length: %i, media type: %i\n", len, msbuf[2]);
+	// pclog("Returned length: %i, media type: %i\n", len, msbuf[2]);
 
 	ioctl_close(id);