Update config VALID_ARCHS for 64-bit Watch #98
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Cupertino has introduced a 64-bit S4 chip in the Apple Watch Series 4. Therefore, frameworks must be build targeting a new
arm64_32ARCH.Since CleanroomLogger enumerates
VALID_ARCHs in the project.xcconfig, this will need to be updated when a new processor architecture is introduced in a shipping product, as has happened recently. This PR updates the config accordingly.