[issue20935] Cherry pick CFLAGS, add to flags for $(BUILDPYTHON) Makefile rule

[Jeffrey Walton]

Jeffrey Walton added the comment:

And:

Modules/_freeze_importlib: Modules/_freeze_importlib.o $(LIBRARY_OBJS_OMIT_FROZEN)
	$(LINKCC) -g3 -fsanitize=address $(PY_LDFLAGS) -o $@ Modules/_freeze_importlib.o $(LIBRARY_OBJS_OMIT_FROZEN) $(LIBS) $(MODLIBS) $(SYSLIBS) $(LDLAST)

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<http://bugs.python.org/issue20935>
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