Update Windows build to sqlite 3.6.21.
diff --git a/Tools/buildbot/external-common.bat b/Tools/buildbot/external-common.bat
index 839a4cd..7395db5 100644
--- a/Tools/buildbot/external-common.bat
+++ b/Tools/buildbot/external-common.bat
@@ -16,7 +16,7 @@
 @rem if exist db-4.4.20 rd /s/q db-4.4.20

 @rem if exist db-4.7.25.0 rd /s/q db-4.7.25.0

 @rem if exist openssl-0.9.8l rd /s/q openssl-0.9.8l

-@rem if exist sqlite-3.5.9 rd /s/q sqlite-3.5.9    

+@rem if exist sqlite-3.6.21 rd /s/q sqlite-3.6.21    

 

 @rem bzip

 if not exist bzip2-1.0.5 (

@@ -39,7 +39,7 @@
 if not exist tk-8.5.2.0 svn export http://svn.python.org/projects/external/tk-8.5.2.0

 

 @rem sqlite3

-if not exist sqlite-3.5.9 (

+if not exist sqlite-3.6.21 (

   rd /s/q sqlite-source-3.3.4

-  svn export http://svn.python.org/projects/external/sqlite-3.5.9

+  svn export http://svn.python.org/projects/external/sqlite-3.6.21

 )