|EVP_get_digestbyname| and |EVP_get_digestbynid|: recognize MD4. This benefits nodejs. Change-Id: I21bf7e64c2a44e96f27b427ad4bd44551c33221c Reviewed-on: https://boringssl-review.googlesource.com/5721 Reviewed-by: Adam Langley <agl@google.com>