[ET Trac] [Einstein Toolkit] #985: add OPTIONAL dependency on MPI to HDF5

[Einstein Toolkit]

#985: add OPTIONAL dependency on MPI to HDF5
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 Reporter:  rhaas                  |       Owner:     
     Type:  defect                 |      Status:  new
 Priority:  minor                  |   Milestone:     
Component:  EinsteinToolkit thorn  |     Version:     
 Keywords:  HDF5                   |  
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 With #980 thorns using a compiled HDF5 version that has parallel MPI
 enabled (such as the the one on my debian system which I need because
 either PetSC or libsiloh5 wanted it) do not compile anymore. Adding
 {{{
 OPTIONAL HDF5
 {
 }
 }}}
 to ExternalLibraries/HDF5's confguration.ccl fixes this. Ok to apply?

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/985>
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