[NPANDAY-505] add backup paths for old tools versions

Not all SDKs will set the registry values for these, so look up based on
the following table: http://msdn.microsoft.com/en-us/library/bb397428.aspx

git-svn-id: https://svn.apache.org/repos/asf/incubator/npanday/trunk@1609387 13f79535-47bb-0310-9956-ffa450edef68