Function breez_sdk_liquid::bitcoin::util::key::secp256k1::ffi::secp256k1_ecdsa_signature_serialize_der
pub unsafe extern "C" fn secp256k1_ecdsa_signature_serialize_der(
cx: *const Context,
output: *mut u8,
out_len: *mut usize,
sig: *const Signature,
) -> i32