etc/Makefile cleanup

[Steve O'Hara-Smith]

On Fri, 11 Jan 2008 13:16:13 +0100
"Simon 'corecode' Schubert" <corecode at fs.ei.tum.de> wrote:

> That's bad.  We should find a better way that a) relying on the user to
> prevent the user from hurting itself and b) annoying the user.

	This applies in general to make upgrade not just to the file
removal. Perhaps make buildworld could create a build timestamp file that
make installworld installs and make upgrade checks.

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