[fixinc patch] Put _KERNEL hack into regular fixincludes

[Bruce Korb]

Nathanael Nerode wrote:
> 
> This is the best I can do for the _KERNEL hack from fixinc.svr4.  The
> hack has been around since at least 1992, the oldest CVS record on gcc.gnu.org
> (!) and so I cannot be sure what its original motivation was.
> 
> Bruce, is this OK for mainline?  There isn't going to be anything better for
> this fix.  :-/

``i?86-sequent-sysv[34]*'' can be rewritten ``i?86-sequent-sysv3'' though
I suppose that's a nit.  If any of the listed files are already in tests/base/...
then you'd avoid creating another file, otherwise you'll wind up with a new
test file.  This will wrap the empty file.

Anyway, with those caveats, looks fine to me.