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Fix CMakeLists.txt by setting a boolean in if conditions (#783)

Summary:
As titled

Set `CMAKE_TOOLCHAIN_IOS` in an if condition.

Pull Request resolved: https://github.com/pytorch/executorch/pull/783

Reviewed By: kirklandsign

Differential Revision: D50131292

Pulled By: larryliu0820

fbshipit-source-id: c8d053635d0c4d0d1e7b632f72ab2a3a1f37accc
M
Mengwei Liu committed
0615470a7e7aa8739e5d40356655967ee5c2ac7a
Parent: 2f7c03f
Committed by Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com> on 10/10/2023, 8:28:15 PM