Remove GL/EGL function pointers from tests. The auto-gen loader code should be able to handle all these cases. Bug: angleproject:3393 Change-Id: If0a90fb29d79f2892fdf76fe0cb91ed0036ee1e3 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1756083 Commit-Queue: Courtney Goeltzenleuchter <courtneygo@google.com> Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>