bpo-38234: Fix test_embed.test_init_setpath_config() on FreeBSD #16406
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Explicitly preinitializes with a Python preconfiguration to avoid
Py_SetPath() implicit preinitialization with a compat
preconfiguration.
Fix also test_init_setpath() and test_init_setpythonhome() on macOS:
use self.test_exe as the executable (and base_executable), rather
than shutil.which('python3').
https://bugs.python.org/issue38234