cext: use sys.executable instead of deprecated Py_GetProgramFullPath Fix warning with Python 3.13: mercurial/cext/parsers.c: In function 'check_python_version': mercurial/cext/parsers.c:1243:30: warning: 'Py_GetProgramFullPath' is deprecated [-Wdeprecated-declarations] 1243 | Py_GetProgramFullPath()); | ^~~~~~~~~~~~~~~~~~~~~ In file included from /usr/include/python3.13/Python.h:119, from mercurial/cext/parsers.c:11: /usr/include/python3.13/pylifecycle.h:43:43: note: declared here 43 | Py_DEPRECATED(3.13) PyAPI_FUNC(wchar_t *) Py_GetProgramFullPath(void); | ^~~~~~~~~~~~~~~~~~~~~ At this point in time, the PyConfig struct memory has been released and the PyConfig API can't be used. https://docs.python.org/3.13/c-api/init.html#c.Py_GetProgramFullPath recommands using sys.executable instead. Let's assume that will work in all versions. It would perhaps be better to use PySys_GetObject, but I prefer to stay consistent with how the same function is retrieving sys.hexversion.