Upgrade bzip2 to 1.0.6.
diff --git a/Tools/buildbot/external-common.bat b/Tools/buildbot/external-common.bat
index 118871c..8028db8 100644
--- a/Tools/buildbot/external-common.bat
+++ b/Tools/buildbot/external-common.bat
@@ -4,7 +4,7 @@
 cd ..
 @rem XXX: If you need to force the buildbots to start from a fresh environment, uncomment
 @rem the following, check it in, then check it out, comment it out, then check it back in.
-@rem if exist bzip2-1.0.5 rd /s/q bzip2-1.0.5
+@rem if exist bzip2-1.0.6 rd /s/q bzip2-1.0.6
 @rem if exist tcltk rd /s/q tcltk
 @rem if exist tcltk64 rd /s/q tcltk64
 @rem if exist tcl8.4.12 rd /s/q tcl8.4.12
@@ -18,9 +18,9 @@
 @rem if exist sqlite-3.7.4 rd /s/q sqlite-3.7.4    
 
 @rem bzip
-if not exist bzip2-1.0.5 (
-   rd /s/q bzip2-1.0.3
-  svn export http://svn.python.org/projects/external/bzip2-1.0.5
+if not exist bzip2-1.0.6 (
+   rd /s/q bzip2-1.0.5
+  svn export http://svn.python.org/projects/external/bzip2-1.0.6
 )
 
 @rem Sleepycat db