Add HDIO_* ioctls defined in linux/hdreg.h

* linux/ioctlent.sh: Add HDIO_* ioctls (0x03..) defined in
linux/hdreg.h header file.
This fixes Debian bug #450953.
diff --git a/linux/ioctlent.sh b/linux/ioctlent.sh
index 3977abf..a0e71e7 100755
--- a/linux/ioctlent.sh
+++ b/linux/ioctlent.sh
@@ -60,6 +60,7 @@
 
 > ioctls.h
 
+lookup_ioctls 03 linux/hdreg.h
 lookup_ioctls 22 scsi/sg.h
 lookup_ioctls 46 linux/fb.h
 lookup_ioctls 4B linux/kd.h