[MacPorts] #49373: fftw-3 @3.3.4_1: add variant with patches for pfft, fix test phase for mpi

[MacPorts]

#49373: fftw-3 @3.3.4_1: add variant with patches for pfft, fix test phase for mpi
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 Reporter:  dstrubbe@…   |      Owner:  sean@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.3.4
 Keywords:  haspatch     |       Port:  fftw-3
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 Add new variant with patches that are recommended for use as a dependency
 for pfft, a new port I just added.

 Also, add configure arg to allow test phase to work with mpi variant.

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Ticket URL: <https://trac.macports.org/ticket/49373>
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