Checkout sqlite-source when it is not there.
diff --git a/Tools/buildbot/external-common.bat b/Tools/buildbot/external-common.bat
index cb4b284..b948440 100644
--- a/Tools/buildbot/external-common.bat
+++ b/Tools/buildbot/external-common.bat
@@ -29,3 +29,5 @@
if not exist tcl-8.4.18.2 svn export http://svn.python.org/projects/external/tcl-8.4.18.2
if not exist tk-8.4.18.1 svn export http://svn.python.org/projects/external/tk-8.4.18.1
+@rem sqlite3
+if not exist sqlite-source-3.3.4 svn export http://svn.python.org/projects/external/sqlite-source-3.3.4