We're now C++17 and can use single-argument static_assert, when there isn't a useful message to supply. Change-Id: Ide43232a1eb1bf2ada94e6495c33d40c0443cf61 Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/79428 Auto-Submit: David Benjamin <davidben@google.com> Reviewed-by: Adam Langley <agl@google.com> Commit-Queue: Adam Langley <agl@google.com>