l3build: No longer need cleanaux

As typesetting is now done outside of the main dir, there is no need to
clean up aux files each time. However, this is retained for the "clean" target
as that ideally cleans up 'fully', which should include any files that have
been generated by the end user.


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@5113 de43f980-851b-0410-b2f7-c40aca1f87e0
l3build: Add module name to "allmodules" diagnostic info

Printing the module name here means that if something goes wrong it should be
a bit easier to track down.


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@5114 de43f980-851b-0410-b2f7-c40aca1f87e0