[ET Trac] [Einstein Toolkit] #585: Add thorn FFTW3 to manifest

[Einstein Toolkit]

#585: Add thorn FFTW3 to manifest
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 Reporter:  eschnett  |       Owner:     
     Type:  defect    |      Status:  new
 Priority:  critical  |   Milestone:     
Component:  Other     |     Version:     
 Keywords:            |  
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 I believe the PITTNullCode requires thorn ExternalLibraries/FFTW3.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/585>
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