* autoload.cc: Add winmm functions needed by fhandler_dsp.cc.

* fhandler_dsp.cc: New file.  Implements OSS like /dev/dsp.
* include/sys/soundcard.h: New file.  User land includes for OSS /dev/dsp.
* fhandler.h: Add new class fhandler_dev_dsp and a FH_OSS_DSP definition.
* dtable.cc (dtable::build_fhandler): Allow creation of the /dev/dsp device.
* path.cc (windows_device_names): Add /dev/dsp into list of device names.
* Makefile.in (DLL_OFILES): Add fhandler_dsp.o.

winsup/cygwin/dtable.cc

@@ -316,6 +316,9 @@ dtable::build_fhandler (int fd, DWORD dev, const char *name, int unit)
       case FH_CLIPBOARD:
 	fh = new (buf) fhandler_dev_clipboard (name);
 	break;
+      case FH_OSS_DSP:
+	fh = new (buf) fhandler_dev_dsp (name);
+	break;
       default:
 	/* FIXME - this could recurse forever */
 	return build_fhandler (fd, name, NULL);