Remove libpng and zlib from dEQP include dirs. These extra include dirs were not being rebased correctly in the BUILD.gn side. Instead add them later in angle_deqp_support. The GN build already had the correct deps in any case. BUG=angleproject:1569 Change-Id: Ieb4fab47bd9948a3309da239f2efdafbfcc8782c Reviewed-on: https://chromium-review.googlesource.com/722065 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>