ecore_x: remove support XGesture extension

ecore_x: remove support XGesture extension

Summary:
This was a X11 extension mainly developed for Tizen. By now I can only
find it packaged by Gentoo as the only Linux distribution and Tizen is
now longer using it either. Bringing it up during EDD and on the mailing
list did not come up with any users.
I think we can go ahead and deprecate the API and remove the
functionality.

Reviewers: raster, cedric, devilhorns, zmike

Reviewed By: devilhorns

Subscribers: cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D10823