Switch primitives test to use 'in line' data

This makes for a longer but self-contained test file. As we no longer have 
l3names.sty as a separate file the list of primitives has to be looked after
by hand in any case.


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4828 de43f980-851b-0410-b2f7-c40aca1f87e0