RFR: JDK-8154237: Compare script broken for windows native library deps comparison

[Tim Bell]

Erik:

> One of the things the build compare script looks at is the list of 
> dependencies for each native library and executable. This comparison 
> is currently broken on Windows.
>
> I have verified that this patch actually compares the dependency 
> output from dumpbin on Windows and that we still have a clean baseline 
> with two consecutive builds on all platforms.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8154237
> Webrev: http://cr.openjdk.java.net/~erikj/8154237/webrev.01

Looks good to me.

/Tim