dEQP assumes EGLNativeDisplayType is a pointer, but EGL recently defined
it to be an integer.

BUG=angleproject:1707

Change-Id: Ief68c763ce159db44f4008cced47e87d92342861
Reviewed-on: https://chromium-review.googlesource.com/434761Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>