Rerenders fail with 'TARGET_OS_TV' is not defined

[xhochy]

I see a lot of projects failing with the following error with clang=11 on osx-64:

error: 'TARGET_OS_TV' is not defined, evaluates to 0 [-Werror,-Wundef-prefix=TARGET_OS_]
#if !(defined(__APPLE__) && (TARGET_OS_TV || TARGET_OS_WATCH))

See Azure build for nodejs PR as an example.

This is because we are still on the 10.9 SDK which doesn't come with a corresponding TargetConditionals.h header. The 11 SDK has the corresponding header and thus the jobs don't fail there.

This is a hard -Werror failure baked into clang that cannot be deactivated easily by the user https://github.com/llvm/llvm-project/blob/176249bd6732a8044d457092ed932768724a6f06/clang/lib/Driver/ToolChains/Darwin.cpp#L961-L964