Regen the global objects using PYTHON_FOR_REGEN. (gh-31344)

https://bugs.python.org/issue46541

Author: ericsnowcurrently

Makefile.pre.in

@@ -1176,8 +1176,8 @@ regen-importlib: regen-frozen
 # Global objects
 
 .PHONY: regen-global-objects
-regen-global-objects: $(srcdir)/Tools/scripts/generate_global_objects.py $(FREEZE_MODULE_DEPS)
-	$(PYTHON_FOR_FREEZE) $(srcdir)/Tools/scripts/generate_global_objects.py
+regen-global-objects: $(srcdir)/Tools/scripts/generate_global_objects.py
+	$(PYTHON_FOR_REGEN) $(srcdir)/Tools/scripts/generate_global_objects.py
 
 ############################################################################
 # ABI

Tools/scripts/generate_global_objects.py

@@ -5,7 +5,7 @@
 import sys
 
 
-assert os.path.isabs(__file__), __file__
+__file__ = os.path.abspath(__file__)
 ROOT = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
 INTERNAL = os.path.join(ROOT, 'Include', 'internal')