RFR: JDK-8204127: Change bundle format on Windows to zip

[Erik Joelsson]

The compressed archive bundles we create are all tar.gz format. On 
Windows that's not a very common format, requiring third party 
applications to handle, while the zip format can be natively extracted. 
This patch changes the bundle format for the JDK on Windows to zip.

This only applies to the actual product distributions. I think we prefer 
tar.gz for all the internal bundles, like symbols and tests.

Bug: https://bugs.openjdk.java.net/browse/JDK-8204127

Webrev: http://cr.openjdk.java.net/~erikj/8204127/webrev.01

/Erik