mitogen.parent: Detect and avoid Python2.7 wrapper on macOS 11 & 12
Without this errors such as the following occur ``` ✗ MITOGEN_LOG_LEVEL=DEBUG python3 foo.py Python: execv: (null): No such file or directory Traceback (most recent call last): File "foo.py", line 16, in <module> target = router.local(python_path='/usr/bin/python2.7', debug=True) File "/Users/alex/src/mitogen2/mitogen/parent.py", line 2486, in local return self.connect(u'local', **kwargs) File "/Users/alex/src/mitogen2/mitogen/parent.py", line 2446, in connect return self._connect(klass, **mitogen.core.Kwargs(kwargs)) File "/Users/alex/src/mitogen2/mitogen/parent.py", line 2426, in _connect conn.connect(context=context) File "/Users/alex/src/mitogen2/mitogen/parent.py", line 1708, in connect raise self.exception mitogen.parent.EofError: EOF on stream; last 100 lines received: MITO000 MITO001 ``` Before ``` $ ./preamble_size.py SSH command size: 625 Bootstrap (mitogen.core) size: 17007 (16.61KiB) Original Minimized Compressed mitogen.parent 97496 95.2KiB 50355 49.2KiB 51.6% 12663 12.4KiB 13.0% mitogen.fork 8436 8.2KiB 4130 4.0KiB 49.0% 1648 1.6KiB 19.5% mitogen.ssh 10892 10.6KiB 6952 6.8KiB 63.8% 2113 2.1KiB 19.4% mitogen.sudo 12089 11.8KiB 5924 5.8KiB 49.0% 2249 2.2KiB 18.6% mitogen.select 12325 12.0KiB 2929 2.9KiB 23.8% 964 0.9KiB 7.8% mitogen.service 41644 40.7KiB 22431 21.9KiB 53.9% 5886 5.7KiB 14.1% mitogen.fakessh 15599 15.2KiB 8011 7.8KiB 51.4% 2624 2.6KiB 16.8% mitogen.master 48732 47.6KiB 24569 24.0KiB 50.4% 6768 6.6KiB 13.9% ``` After ``` $ ./preamble_size.py SSH command size: 705 Bootstrap (mitogen.core) size: 17007 (16.61KiB) Original Minimized Compressed mitogen.parent 97885 95.6KiB 50516 49.3KiB 51.6% 12728 12.4KiB 13.0% mitogen.fork 8436 8.2KiB 4130 4.0KiB 49.0% 1648 1.6KiB 19.5% mitogen.ssh 10892 10.6KiB 6952 6.8KiB 63.8% 2113 2.1KiB 19.4% mitogen.sudo 12089 11.8KiB 5924 5.8KiB 49.0% 2249 2.2KiB 18.6% mitogen.select 12325 12.0KiB 2929 2.9KiB 23.8% 964 0.9KiB 7.8% mitogen.service 41644 40.7KiB 22431 21.9KiB 53.9% 5886 5.7KiB 14.1% mitogen.fakessh 15599 15.2KiB 8011 7.8KiB 51.4% 2624 2.6KiB 16.8% mitogen.master 48733 47.6KiB 24570 24.0KiB 50.4% 6771 6.6KiB 13.9% ```pull/882/head
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