bpo-38858: new_interpreter() reuses _PySys_Create() (GH-17481)

new_interpreter() now calls _PySys_Create() to create a new sys
module isolated from the main interpreter. It now calls
_PySys_InitCore() and _PyImport_FixupBuiltin().

init_interp_main() now calls _PySys_InitMain().
3 files changed