Use vars rather than literals for extensions


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4826 de43f980-851b-0410-b2f7-c40aca1f87e0
Allow for .def files to support tests (Lua script)

Not sure if this is quite the right approach: it's a bit of a hack for a
one-off case. May yet revise how the test is set up instead.


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4827 de43f980-851b-0410-b2f7-c40aca1f87e0