🍒[cxx-interop] Lower iOS deployment target for Cxx and CxxStdlib #77930
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Explanation: The iOS/watchOS/tvOS deployment targets for Cxx and CxxStdlib binaries got unintentionally bumped in b87b263, which is causing build failures when trying to back-deploy Swift libraries. This reverts the deployment targets to the older versions.
Scope: Changes the CMake build script for Cxx and CxxStdlib targets.
Risk: Low, this only affects two C++ interop overlay modules, and it only brings back the pre-6.0.2 behavior.
Issue: rdar://140823785 / resolves #77909
Reviewer: @DougGregor @Xazax-hun @drodriguez
Original PR: #77921