Guard against fake interpreters. #1500
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Instead of assuming an interpreter that exits 0 is valid, force the purported interpreter to execute some code that outputs a file to both prove its a binary that can execute Python code and identify itself. Fixes pex-tool#1494
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Instead of assuming an interpreter that exits 0 is valid, force the
purported interpreter to execute some code that outputs a file to
both prove it's a binary that can execute Python code and identify
itself.
Fixes #1494