Add reference to setuptools issue. Ref #3648.

Author: jaraco

CHANGES.rst

@@ -50,7 +50,7 @@ v67.2.0
 
 Changes
 ^^^^^^^
-* #3809: Merge with distutils@8c3c3d29, including fix for ``sysconfig.get_python_inc()`` (pypa/distutils#178), fix for segfault on MinGW (pypa/distutils#196), and better ``has_function`` support (pypa/distutils#195).
+* #3809: Merge with distutils@8c3c3d29, including fix for ``sysconfig.get_python_inc()`` (pypa/distutils#178), fix for segfault on MinGW (pypa/distutils#196), and better ``has_function`` support (pypa/distutils#195, #3648).
 
 
 v67.1.0