package/libev: bump version to 4.22

This patch also fixes the broken download of version 4.19 because
upstream move the archive file to Attic/

Removed patch after upstream applied a similar fix:
http://cvs.schmorp.de/libev/ev.c?r1=1.476&r2=1.477



Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>