Pieter Wuille 4462cb0498 Adapt to libsecp256k1 API changes
* Use SECP256K1_CONTEXT_NONE when creating signing context, as
  SECP256K1_CONTEXT_SIGN is deprecated and unnecessary.
* Use secp256k1_static_context where applicable.
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..
2022-07-20 15:34:36 +02:00
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