Update secp256k1 sources (#52)
We're now at 8746600eec5e7fcd35dabd480839a3a4bdfee87b, same as bitcoin core at 747cdf1d652d8587e9f2e3d4436c3ecdbf56d0a5
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We're now at 8746600eec5e7fcd35dabd480839a3a4bdfee87b, same as bitcoin core at 747cdf1d652d8587e9f2e3d4436c3ecdbf56d0a5