I know that VS2010 isn't Oracle's default compiler for Windows, but others like SAP are still using it. The fix for JDK-8175293 introduced a struct assignment which is not supported by VS2010:

prevScaleRec = { -1, -1, -1 };

The fix is rather trivial and would keep the JDK9 sources buildable with VS2010:

prevScaleRec.scaleX = prevScaleRec.scaleY = prevScaleRec.screen = -1;