libsecp256k1 really only barely uses libc at all, and in practice,
things like memcpy/memcmp get optimized into something other than a
libc call. Thus, if we provide simple stub headers, things seem to
work with wasm-pack just fine.
* rust-bitcoin/master:
Fix no-std raw test, after removal of lang items
Fix broken benchmarks
Disable emscripten tests until they work again https://github.com/rust-lang/rust/issues/66916https://github.com/rustwasm/team/issues/291
Add constant of the prime of the curve field.
Simplify callback logic to returning raw coordinates
Removed no longer used dont_replace_c_symbols feature
Fix wrong feature name external-symbols
Fix missing return c_int in NonceFn