Deleted unnecessary built-in conditions A few built-in variables are checking against overly complicated extension conditions, deleting these will make the array lookup easier to implement. Also changed functionality to always enable GL_OVR_multiview when GL_OVR_multiview2 is enabled Bug: angleproject:3805 Change-Id: I10fc7db0fa8b496fbba8b2c27a7311ac3c24dbe4 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1752082 Commit-Queue: Clemen Deng <clemendeng@google.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>