Small spawn fixes #6498
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Small spawn fixes #6498
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This was disabled because we can't close them in the parent, but posix_spawn provides a way to close during the fork. This code was active but not reachable.
Most of this will never be possible with posix_spawn so having the commented code from CRuby is not useful.
Now uses posix_spawn rather than opening file in parent process, and properly uses WRONLY when redirecting out and err.
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Various fixes to try to tidy up tests and specs we are not currently passing.