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* Add _PYTHON_SUBPROCESS_USE_POSIX_SPAWN environment knob Add support for disabling the use of `posix_spawn` via a variable in the process environment. While it was previously possible to toggle this by modifying the value of `subprocess._USE_POSIX_SPAWN`, this required either patching CPython or modifying it within the interpreter instance which is not always possible, such as when running applications or scripts not under a user's control. Signed-off-by: Vincent Fazio <vfazio@gmail.com> * fixup NEWS entry --------- Signed-off-by: Vincent Fazio <vfazio@gmail.com>