<AWT Dev> RFR: 8210886: Remove references in xwindows.md to non-existent files.

[Dmitry Markov]

Hi Phil,

The changes look good to me.

Thanks,
Dmitry 

> On 26 Sep 2018, at 19:23, Phil Race <philip.race at oracle.com> wrote:
> 
> bug: https://bugs.openjdk.java.net/browse/JDK-8210886
> webrev: http://cr.openjdk.java.net/~prr/8210886/
> 
> the legal file xwindows.md gives attribution for several source files
> from the X11 distribution which in fact are not present anywhere.
> Some really ancient (1.5 ?) version of Oracle JDK had some of them
> and extitil.h was removed during the JDK 9 cycle since it was unused
> but that didn't stop it being listed in the legal file.
> 
> -phil.
> 
>