webkitgtk: bump to version 2.22.3

webkitgtk: bump to version 2.22.3

Release notes:

    https://webkitgtk.org/2018/10/29/webkitgtk2.22.3-released.html

Patch "0001-ARM-Building-FELightingNEON.cpp-fails-due-to-missing.patch"
is removed because it is included in the new release.

This is a maintenance release which further improves playback of video
when using media source extensions (MSE), specially for WebM content,
and provides a few correctness fixes.

Signed-off-by: Adrian Perez de Castro <aperez@igalia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>