Removed useless Python version check, gone entirely in 2.13

src/Zope2/Startup/__init__.py

@@ -359,13 +359,8 @@ class UnixZopeStarter(ZopeStarter):
 
 
 def check_python_version():
-    # check for Python version
-    python_version = sys.version.split()[0]
-    optimum_version = '2.3.4'
-    if python_version < '2.3.4':
-        raise ZConfig.ConfigurationError(
-            'Invalid python version: %s, the optimal version is %s or higher' %
-            (python_version, optimum_version))
+    # BBB removed in Zope 2.13
+    pass
 
 
 def dropPrivileges(cfg):