Webkitgtk-2.4 is unmaintained upstream and contains a large number of
security vulnerabilities. The webkitgtk developers have asked
distributions to stop offering it. [0]

This patch removes webkitgtk-2.4 from guitarix. Guitarix builds and
starts without; I don't know what features are disabled.

Ricardo, what do you think?

[0]
https://blogs.gnome.org/mcatanzaro/2016/02/01/on-webkit-security-updates/