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New version of the patch:
 - factorize code between execve(), spawnve() and spawnvpe()
 - support also surrogates in environment variable names
 - support bytes and bytearray (bytearray cannot be used as a dictionary key, but my patch supports it)
 - remove unrelated fix (my first patch contains a fix for os.system(), also about surrogates)
Because of the factorization, the error messages doesn't contain the function name anymore. spawnve() and spawnvpe() omit BEGINLIBPATH and ENDLIBPATH, as execve(): "that Would Confuse Programs if Passed On". I suppose that if execve() ignore them, spawn*e() should also ignore them.
I don't have an OS/2, so I'm unable to test my patch on this OS :-/
Note: The patch fixes also subprocess to support bytes and bytearray in the environment dictionary.