[OpenJDK 2D-Dev] RFR: 8056210: Move libawt file to windows directory

[Phil Race]

https://bugs.openjdk.java.net/browse/JDK-8056210
http://cr.openjdk.java.net/~prr/8056210/
Simple clean-up of moving code used only on windows into a  windows 
source directory
JPRT is happy ..

-phil.