Software are rebuilt automatically with change of version

Until now, when you changed the version of a software in an already-built
system, its tarball would be downloaded, but it wouldn't actually
build. The only way would be to force the build by deleting the main target
of that file (under `.local/version-info/TYPE/PROGRAM'). This was because
the tarballs were an order-only prerequisite which was implemented some
time ago based on some theoretical argument that if the tarball dates
changes, the software should not be rebuilt (because we check the
checksum).

However, the problems this causes are more than those it solves: Users may
forget to delete the main target of the program and mistakenly think that
they are using the new version. The fact that all the numbers going into
the paper also contain this number further hides this.

With this commit, tarballs are no longer order-only and any time a version
of a software is updated, it will be automatically built and not cause
confusion and manual intervention by the users. As a result of this change,
I also had to correct the way we find the tarball from the list of
prerequisites.

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