Enable sleef in xplat_exported_deps of aten_headers_for_executorch

[swolchok]

Stack from ghstack (oldest at bottom):

• Re-reapply "Add vectorized_math.h (#11204)", "Add optimized_portable_kernels test (#11205)", and "Add vectorization in elementwise_util (#9432)" #11802
• -> Enable sleef in xplat_exported_deps of aten_headers_for_executorch #11801
• ET_HAS_EXCEPTIONS: require defined(_MSC_VER) to conclude _HAS_EXCEPTIONS implies exceptions are on #11770

I had trouble getting this working in D74208085. Let's try again separately now that that diff is passing CI.

Differential Revision: D75897564

[pytorch-bot]

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✅ You can merge normally! (2 Unrelated Failures)

As of commit badd505 with merge base 44d2643 ():

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

• pull / test-models-linux-basic (vit, xnnpack-quantization-delegation, cmake, linux.2xlarge, executorch-u... / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

BROKEN TRUNK - The following job failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-moshi-linux / linux-job (gh) (trunk failure)
  test_exported_decoder_xnnpack

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D75897564

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