Is it okay to commit the following patch for PR 33431,
to allow building standalone programs without DESTDIR?
(arch/sparc/stand/bootblk/Makefile also requires the similar fix)

<060726204808.M0117230@mirage.ceres.dti.ne.jp> on source-changes
I wrote:

> simonb@NetBSD.org wrote:
> 
> > We previously had a (unwritten?) goal of being able to build
> > sys/arch/*/stand without ${DESTDIR}.  Do we still want to be able to do
> > this?  I still find it handy to be able to do this to test out fixes and
> > changes for bootblocks without having to run a partial build.sh first...
> 
> IMHO, the required fix is trivial, so we should keep
> the (actually useful and reasonable) goal :-)
> (though I'm not sure which Makefile or Makefile.inc is better)
> ---
> Izumi Tsutsui
> 
> 
> Index: sys/lib/libkern/Makefile
> ===================================================================
> RCS file: /cvsroot/src/sys/lib/libkern/Makefile,v
> retrieving revision 1.80
> diff -u -r1.80 Makefile
> --- sys/lib/libkern/Makefile	27 Apr 2006 20:43:09 -0000	1.80
> +++ sys/lib/libkern/Makefile	26 Jul 2006 11:42:19 -0000
> @@ -28,6 +28,8 @@
>  .include "${.PARSEDIR}/../../../common/lib/libc/Makefile.inc"
>  .include "${.PARSEDIR}/../../../common/lib/libprop/Makefile.inc"
>  
> +CPPFLAGS+=	-I${KERNDIR}/../../../common/include
> +
>  .PATH.c: ${KERNDIR}
>  .if exists ($M/Makefile.inc)
>  .PATH.c: $M
>