Use temporary path variable in loop per @dirk-thomas 's suggestion

cmake/templates/_setup_util.py.in

@@ -154,16 +154,15 @@ def _prefix_env_variable(environ, name, paths, subfolders):
     environ_paths = [path for path in value.split(os.pathsep) if path]
     checked_paths = []
     for path in paths:
-        path0 = path
         if type(subfolders) != type([]):
             subfolders = [subfolders]
         for subfolder in subfolders:
-            path = path0
+            path_tmp = path
             if subfolder:
-                path = os.path.join(path, subfolder)
+                path_tmp = os.path.join(path_tmp, subfolder)
             # exclude any path already in env and any path we already added
-            if path not in environ_paths and path not in checked_paths:
-                checked_paths.append(path)
+            if path_tmp not in environ_paths and path_tmp not in checked_paths:
+                checked_paths.append(path_tmp)
     prefix_str = os.pathsep.join(checked_paths)
     if prefix_str != '' and environ_paths:
         prefix_str += os.pathsep