Drop DEFINE_STACK_OF.

We never need to define the actual structs because we always cast them
before use. The types only exist to be distinct, and they can do that
without a definition.

Change-Id: I1e1ca0833b383f3be422675cb7b90dacbaf82acf
Reviewed-on: https://boringssl-review.googlesource.com/5593
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
3 files changed