Set APPLICATION_EXTENSION_API_ONLY = YES
Set APPLICATION_EXTENSION_API_ONLY = YES

We don't use any APIs that are not app-extension-safe, so this is just
general best practice.

apple/swift-llbuild,apple/swift-llbuild,apple/swift-llbuild,apple/swift-llbuild,apple/swift-llbuild,apple/swift-llbuild,apple/swift-llbuild