[2.7] closes bpo-35139: The `pyexpat` module's macros in `Modules/Setup` now...

[2.7] closes bpo-35139: The `pyexpat` module's macros in `Modules/Setup` now match `setup.py` (GH-10293)

This could cause compile errors on macOS or other platforms..
(cherry picked from commit 318ab63c)
Co-authored-by: Max Bélanger <aeromax@gmail.com>

Misc/NEWS.d/next/Build/2018-11-01-15-01-23.bpo-35139.XZTttb.rst

+Fix a compiler error when statically linking `pyexpat` in `Modules/Setup`.

Modules/Setup.dist

@@ -469,7 +469,7 @@ GLHACK=-Dclear=__GLclear
 # Interface to the Expat XML parser
 # More information on Expat can be found at www.libexpat.org.
 #
-#pyexpat expat/xmlparse.c expat/xmlrole.c expat/xmltok.c pyexpat.c -I$(srcdir)/Modules/expat -DHAVE_EXPAT_CONFIG_H -DUSE_PYEXPAT_CAPI
+#pyexpat expat/xmlparse.c expat/xmlrole.c expat/xmltok.c pyexpat.c -I$(srcdir)/Modules/expat -DHAVE_EXPAT_CONFIG_H -DXML_POOR_ENTROPY=1 -DUSE_PYEXPAT_CAPI
 
 
 # Hye-Shik Chang's CJKCodecs