Fix pocketfft

[metascroy]

Fixes memalign on Apple platforms in pocketfft: see mreineck/pocketfft#28

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17746

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❌ 6 New Failures, 1 Unrelated Failure

As of commit ab32240 with merge base b5dbfb7 ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
• pull / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh)
  RuntimeError: Command docker exec -t 3fd146a6696b8feacf04416609746a180576af9013e49932265e6cc1c15fb10f /exec failed with exit code 92
• pull / test-qnn-wheel-packages-linux (3.10) / linux-job (gh)
  RuntimeError: Command docker exec -t b773b3dfc860168874f12267b93fd213efb233fec618bb550f8b24ee8ca4e8f7 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.11) / linux-job (gh)
  RuntimeError: Command docker exec -t 5acd20fd7dd3e043c2abec560b0be8f5220c4cc22dc6775b0b936c5509b819de /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.12) / linux-job (gh)
  RuntimeError: Command docker exec -t ab67e6aaa582fc5bf29a217b24a05d2478bed917d7644795f3ec74a38243998b /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.13) / linux-job (gh)
  RuntimeError: Command docker exec -t d95e329757dc88eb813a3db34fc4661c1950edc1cd7965d027aec15ffd76dda2 /exec failed with exit code 1

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-llama-runner-qnn-linux (fp32, qnn_8a8w, qnn) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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