hg: openjfx/jfx-dev/rt: 8210218: WebKit build fails with newer versions of VS 2017

[arunprasad.rajkumar at oracle.com]

Changeset: c203627bae51
Author:    arajkumar
Date:      2018-09-06 10:32 +0530
URL:       http://hg.openjdk.java.net/openjfx/jfx-dev/rt/rev/c203627bae51

8210218: WebKit build fails with newer versions of VS 2017
Reviewed-by: kcr, jvos

! modules/javafx.web/src/main/native/Source/WTF/wtf/Variant.h