SIMD-0129: simplify alt_bn128 syscall error codes

Active on mainnet-beta (epoch 635), testnet (epoch 657) and devnet (epoch 714).

Introduced in anza-xyz/agave PR #319.

Feature id JDn5q3GBeqzvUa7z67BbmVHVdE3EbUAjvFep3weR3jxX.

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• SIMD-0129

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