Backport: fix deprecated warnings#3425

Merged

andypugh merged 2 commits intoLinuxCNC:2.9from

BsAtHome:backport_2.9_fix-deprecated

May 19, 2025

Commits on Apr 29, 2025

Fix deprecated Py_SetProgramName() and deprecated use of Py_UnbufferedStdioFlag.
BsAtHome
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Make using PyConfig conditional on python version >= 3.8.
BsAtHome
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