event-loop: remove extra header
event-loop: remove extra header

we don't use assert() anywhere in this file, so remove #include <assert.h>

Signed-off-by: Marek Chalupa <a05df156a69ad59faa9af9b666ef78009594c145@gmail.com>
Reviewed-by: Bryce Harrington <bdb14cfc1ab8d24e13de84adc40b41ae60c13bd1@osg.samsung.com>

mchalupa/wayland,mchalupa/wayland,sir-murray/wayland,sir-murray/wayland,mchalupa/wayland,sir-murray/wayland