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Draft: Resolve "The m4 macro for PFFT seems to be broken"

Martin Lueders requested to merge 894-the-m4-macro-for-pfft-seems-to-be-broken into main

Description

A recent MR has removed the acx_fftw_mpi variable from the fftw m4. This has broken the m4 for pfft. This MR fixes the m4 for pfft by removing the dependency on fftw-mpi.

News snippet

Fix the m4 for pfft.

Checklist

  • I have checked that my code follows the Octopus coding standards
  • I have added tests for all the new features added in this request.

Closes #894

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