gh-133183: Include IPHONEOS_DEPLOYMENT_TARGET in iOS shim targets. #133184
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Ensures that
IPHONEOS_DEPLOYMENT_TARGETis included in the target triple used by the iOS compiler shims.This is needed to ensure that an environment-provided
IPHONEOS_DEPLOYMENT_TARGETisn't ignored (or superseded) by the "no min SDK version" implied by-target arm64-apple-ioset al.