[tex-live] About timestamps of TeXLive repo

[Karl Berry]

We recreate all packages when we start the pretest in order to get all
new Catalogue information. Catalogue updates without any update to the
package are frequent. If we didn't recreate, we would never get those.

I guess in principle we could only recreate those packages which do in
fact have Catalogue changes. It is "just" more work and time to figure
that out :(. -k