request to backport some issues to 11

[Johan Vos]

Hi Kevin,

I request permission to backport the following issues to 11-dev:

JDK-8212158    FX: Update copyright year in docs, readme files to 2019
JDK-8218174    Add missing license file for Mesa header files
JDK-8219008    Update OpenGL Headers to version 4.6
JDK-8215775    Scrollbars from web pages appear to be absolute, overlapping
everything
JDK-8220147    Cherry pick GTK WebKit 2.22.7 changes
JDK-8218170    Upgrade antlr to version 4.7.2
JDK-8219917    [WebView] Sub-resource integrity check fails on Windows and
Linux
JDK-8215686    FX build fails using gradle 5
JDK-8217942    Upgrade to libxslt 1.1.33
JDK-8218172    Upgrade gradle to version 5.3
JDK-8219734    [WebView] Get rid of macOS SDK private API usage
JDK-8221941    Wrong package declaration for WCTextRunImpl.java in web
module
JDK-8133841    Full HD video can not be played on standard 1080p screen in
portrait mode
JDK-8222217    FX build fails on 32-bit Windows after fix for JDK-8133841
JDK-8215894    Provide media support for libav version 58

Thanks,

- Johan