NO_TCSH leaves crud in /usr/src

[Colin Percival]

Doug Barton wrote:
> This issue has been around a long time, but I keep forgetting to post
> it. When I enable NO_TCSH in /etc/make.conf, after a build/installworld
> I get this in /usr/src:
> 
> ? bin/csh/gethost
> ? bin/csh/sh.err.h
> ? bin/csh/tc.const.h
> 
> They don't seem to hurt anything, but it would be nice to get this fixed.

The problem is in src/rescue/Makefile.  I'll fix it.

Colin Percival