Make sure HAVE_XLIB propagates to code that needs it.
We AC_SUBSTituted it, but never had a variable for that target in make-variables or anywhere else. Plotter/vtk is the only code that seems to use HAVE_XLIB, so the makefile for it now gets X_CPPFLAGS. Further, in one of our mappers which relies on the define being set on Linux, add an #else clause with an error, so we'll detect that nothing is happening instead silently doing the wrong thing. git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@8903 18c085ea-50e0-402c-830e-de6fd14e8384
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