Issue #14152: Restore the Include/*.h dependencies for extension builds.
diff --git a/setup.py b/setup.py
index 1318bc2..d69875c 100644
--- a/setup.py
+++ b/setup.py
@@ -197,7 +197,7 @@
 
         # Python header files
         headers = [sysconfig.get_config_h_filename()]
-        headers += glob(os.path.join(sysconfig.get_path('platinclude'), "*.h"))
+        headers += glob(os.path.join(sysconfig.get_path('include'), "*.h"))
 
         for ext in self.extensions[:]:
             ext.sources = [ find_module_file(filename, moddirlist)