Touch support - old WPEWebkit referenced by Yocto image

[TomMettam]

With the referenced build of WPEWebkit, touch support does not work:

WebPlatformForEmbedded/WPEWebKit#535

However, this has been fixed in master.

[wouterlucas]

We'll move to WPE 2.22 soon, picking this branch: https://github.com/WebPlatformForEmbedded/WPEWebKit/commits/wpe-2.22

I'd expect to push a recipe change for that within the next few days.

[wouterlucas]

FYI #224 to enable touch, please make sure virtual input disabled. Closing this one.