Xnnpack msvc

[JacobSzwejbka]

Summary

Some fixes to make it compile on msvc

Test plan

will be adding full ci for msvc builds after all the changes are landed

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15224

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⏳ 6 Pending, 1 Unrelated Failure

As of commit fe5da0a with merge base 173b046 ():

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

• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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