Return 3 values for version tuple

As we've added an extra patch level we need to handle this in the
tuple.  Originally authored by i-shenl <[email protected]>

Lib/platform.py

@@ -1282,7 +1282,7 @@ 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():