hg: openjfx/8/graphics/rt: RT-28295 Update libxml2 library to the latest version

[hang.vo at oracle.com]

Changeset: 16f605590496
Author:    peterz
Date:      2013-08-02 17:56 +0400
URL:       http://hg.openjdk.java.net/openjfx/8/graphics/rt/rev/16f605590496

RT-28295 Update libxml2 library to the latest version
On Windows, jfxwebkit.dll is now statically linked to the latest libxml2/libxslt

! build.gradle
! modules/web/src/main/native/Source/WebCore/TargetJava.pri