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build: disable optional use of gmp in internal secp256k1 build #6210
Until secp256k1 is used for verification there is no reason for Bitcoin Core's secp256k1 to link against gmp, even if available. Pass a flag to configure to override the bignum implementation.
This fixes a crash at runtime on ppc64 reported by @gmaxwell.
Edit: tested and appears to work, after autogen and reconfigure,
... whereas it was using gmp before.