make force-tag gone

[Denis Leroy]

Jesse Keating wrote:
> On Tue, 2008-09-09 at 19:53 +0200, Denis Leroy wrote:
>> that's why we have CVS.
> 
> But when you change the only reference point we have, the tag, that goes
> right out the window now doesn't it?

Not there is "cvs update -D" from the build time. Seriously, if you 
really need to recreate a specific koji build failure, it's not exactly 
hard to look at the cvs history and date tags and checkout the exact 
version that produced it...