cpi ignore serialized_len_ptr #29592

Active on mainnet-beta (epoch 469), testnet (epoch 465) and devnet (epoch 445).

Introduced in solana-labs/solana PR #29621.

Feature id 74CoWuBmt3rUVUrCb2JiSTvh6nXyBWUsK4SaMj3CtE3T.

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