[Developers] Define make variable HAVE_HDF5 in CactusExternal/HDF5

[Erik Schnetter]

Define a make variable HAVE_HDF5 in thorn CactusExternal/HDF5 when a  
configuration contains this thorn.  Such a make variable is defined  
by lib/make/extras/HDF5/setup.sh, and for completeness the thorn HDF5  
should also define it.  Other thorns may be testing whether HDF5 is  
available by looking at this make variable.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>

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