After a closer look (thanks Ezio), the proper patch should be something like:


diff --git a/Doc/license.rst b/Doc/license.rst
--- a/Doc/license.rst
+++ b/Doc/license.rst
@@ -874,9 +874,8 @@
 zlib
 ----
 
-The :mod:`zlib` extension is built using an included copy of the zlib
-sources if the zlib version found on the system is too old to be
-used for the build::
+The :mod:`zlib` extension is built using the zlib version found on the system,
+but an included copy of the zlib sources is shipped for the Windows build::
 
   Copyright (C) 1995-2011 Jean-loup Gailly and Mark Adler


because the embedded zlib is not used in the linux build (but always the system one, and if absent, no zlib module is built) while we have several references of Modules/zlib/ files in PC/VC* and PCbuild/*.vcproj (that I can't read); adding to nosy the windows expert to have their opinion.