Fix the cmake config file when configured with autotools

FFTW / fftw3

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Fix the cmake config file when configured with autotools #338

Closed tobim closed 7 months ago

tobim commented 1 year ago

When the autotools based build is used the FFTW3ConfigDeps.cmake file is not generated, so including it fails with an error. By only including it on the condition it exists, the config file can still be used in a limited fashion.

Closes #346, closes #130