Add a LuaTeX tlg file for m3show003 test

At present the 'word wrap' bug in LuaTeX shows up here (TL2014) and so we
need a dedicated test file to allow for it. At some stage presumably this
(and others) will cease to be required!


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@5373 de43f980-851b-0410-b2f7-c40aca1f87e0