fix tuple so it returns exactly 3 values

We have added a 4th and that screws up python behaviour during runtime.

Author: i-shenl

Lib/platform.py

@@ -1106,7 +1106,7 @@ def python_version_tuple():
         will always include the patchlevel (it defaults to 0).
 
     """
-    return tuple(_sys_version()[1].split('.'))
+    return tuple(_sys_version()[1].split('.',2))
 
 def python_branch():