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MKL CPU FFT: explicitly specify layout

Andrey Alekseenko requested to merge aa-4691 into release-2023

Intel changed the default setting for conjugate-even storage in oneMKL 2023.0. Here, we explicitly set the old default value.

Switching to the new default, DFTI_COMPLEX_COMPLEX, might be preferable long-term, but not in the release branch.

Refs #4691 (closed)

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