std: fix compile errors in `std.crypto.ecc` (#23797)
Implemented `neg()` method for `AffineCoordinates` struct of p256,
p384 and secp256k1 curves.
Resolves: #20505 (partially)
a14352b0b2HydroH committed on 5/5/2025, 6:50:25 PM· committed by GitHubparent369177f