build compatibility for c++ & linux #17558
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following suit from b40943e, add a version guard in addition to the ISOC2X check.
The build was previously failing with `error: unknown command: -print-file-name=libstdc++.a` because the command invocation was `zig -print-file-name=libstdc++.a` instead of `zig c++ -print-file-name=libstdc++.a` note: .cxx_compiler_arg1 = "" instead of undefined to avoid breaking existing setups without requiring to run cmake again.
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two changes to restore the ability to build c++ projets, including zig itself with 'zig c++' as a c++ compiler.
closes #17536