edit: This is now more a meta issue to discuss an improved context API, see the discussion below.

I'm arguably late to the party but I believe we should either talk about this now (before we do a release) or never:

Taking a step back, I believe that even given the problems with C, upstream's API is not optimal here. A better API would be to ask the user to provide entropy already in _context_create, or pass NULL explicitly to opt out.

Originally posted by @real-or-random in rust-bitcoin/rust-secp256k1#225 (comment)

Note that this does not need to be a breaking change, we could for example add a new function and deprecate secp256k1_context_create.