Fix #6378. Start IDLE using the proper version of Python based on the directory
tree that idle.bat resides in.

Works with any/all versions of Python installed concurrently.
diff --git a/Misc/NEWS b/Misc/NEWS
index f8dab00..b51a644 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -32,6 +32,9 @@
 Library
 -------
 
+- Issue #6378: idle.bat now runs with the appropriate Python version rather than
+  the system default. Patch by Sridhar Ratnakumar.
+
 - Issue #10470: 'python -m unittest' will now run test discovery by default,
   when no extra arguments have been provided.