webkitgtk3: Adjustment to the BUILD. The aim here is utilizing the webki...

...t2 portion of

webkitgtk3 and move those modules dependent on webkit to this one. This will allow us
to remove the webkit module. This method is borrowed from the lfs folks. If you want to see the diff between the way the BUILD was and this one, visit http://lunar-linux.org/~stumbles/ and diff the two webkitgtk3 files.