The Server Gated Cryptography EKUs are a left-over from 1990's export
regulations. For historical reaons, the SGC EKUs are accepted as a valid
substitute for a server authentication EKU, but they shouldn't be. This
change makes it so that we ignore them.
Change-Id: Ie184c52f588ae391a95d61c474ee6324bdd8f4f2
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/37545
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: David Benjamin <davidben@google.com>