These functions only need to pull in the algorithms they support. The
new API is slightly less friendly in this context because it expects the
caller to have found the end first, but it's easy enough to to write a
small wrapper.
Bug: 42290364
Change-Id: Ibdc44f399182cd5722700917aec6c151221f4674
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/81747
Reviewed-by: Adam Langley <agl@google.com>
Auto-Submit: David Benjamin <davidben@google.com>
Commit-Queue: Adam Langley <agl@google.com>