webkitgtk1: update to 1.10.2

This fixes several issues:
* "Copy link destination" did not work with X clipboard
* "Open in New Window" did not work as expected
* There was no "Open in New Tab"

Version 1.8.3 was used previously because the javascript on some
sites (gmail) was broken with 1.10.2 . By using --disable-jit, those sites
now work perfectly with this version. It feels a bit snappier as well.

Bonus: Score on http://html5test.com/ went from 329 to 347.