Update GL_MAX_CLIP_DISTANCES_EXT validation GL_MAX_CLIP_DISTANCES_EXT is a valid enum to query only if either "GL_APPLE_clip_distance" or "GL_EXT_clip_cull_distance" is supported. Account for the possibility that "GL_EXT_clip_cull_distance" is supported while "GL_APPLE_clip_distance" is not. Bug: angleproject:5458 Change-Id: Ia2a089e0e9e2587449553ead6318b9b35fde0648 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3448688 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: mohan maiya <m.maiya@samsung.com>