Don't include <sys/ioctl.h> in the kernel. Stage 10 (final). Warn if

<sys/ioctl.h> is included in the kernel.  It still compiles.

This set of changes reduces the number of dependencies in LINT/.depend
from about 31000 to about 30000.  This should make LINT kernels
compile a whole 1% faster.  Further reductions to less than 20000
dependencies can easily be made.  E.g., 20 headers of nested spam
from <sys/param.h> for 500 object files gives 10000 dependencies;
less than half of these are real.

sys/sys/ioctl.h

@@ -36,12 +36,16 @@
  * SUCH DAMAGE.
  *
  *	@(#)ioctl.h	8.6 (Berkeley) 3/28/94
- * $Id$
+ * $Id: ioctl.h,v 1.6 1997/02/22 09:45:22 peter Exp $
  */
 
 #ifndef	_SYS_IOCTL_H_
 #define	_SYS_IOCTL_H_
 
+#ifdef KERNEL
+#warning "Don't #include ioctl.h in the kernel.  Include xxxio.h instead."
+#endif
+
 #include <sys/ttycom.h>
 
 /*