std.crypto: Use `featureSetHas` to gate intrinsics

This also fixes a bug where the feature gating was not taking
effect at comptime due to https://github.com/ziglang/zig/issues/6768
67fa3262b1Cody Tapscott committed on 10/29/2022, 12:17:08 AMparentf9fe548
1 file changedLine totals unavailable