RFR: 8189431: Netbeans nb_native project needs to be adapted to new repo structure

[Thomas Stüfe]

Hi all,

may I please have a review of this fix. This fixes the nb_native projects
and adapts them to the new repo structure (removing old dead hotspot branch
etc). It also adds a new windows x64 specific platform.

Bug:

https://bugs.openjdk.java.net/browse/JDK-8189431

Webrev:

http://cr.openjdk.java.net/~stuefe/webrevs/8189431-fix_nb_native-after-repo-change/webrev.00/webrev/

Thanks a lot!

Thomas