Use a 'verbatim copy' approach for the auxiliaries needed in l3unicode-data

This makes the code easier to read, overall, and also will be useful for the
next thing required: handling pdfTeX in some way. (Either a separate .def file
or some additional lines in the current .def file are needed: in both cases
it seems most logical to auto-generate as part of the script rather than
trying to use DocStrip.)


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@5153 de43f980-851b-0410-b2f7-c40aca1f87e0