hardcoded -C argument to ${INSTALL}

[Garrett Wollman]

<<On Tue, 6 May 2003 22:42:51 -0400, The Anarcat <anarcat at anarcat.ath.cx> said:

> I'm afraid that's not what we're dealing with here. We're dealing with
> make world here, which doesn't build those since it doesn't build in a
> clean environment.

Doesn't matter.  At some point, if you are keeping your system
-current (or -stable, for that matter), you pass a milestone (release
or daily snapshot) that can be used to locate an mtree file that
installs the same set of files your `make installworld' installed.

-GAWollman