build: fix target features for rustc 1.96

[CertainLach]

Currently, build of vchord fails on rustc 1.96 with rustc-LLVM ERROR: Cannot select: intrinsic %llvm.x86.avx512.vpdpbusd.512

This intrinsic is a part of avx512f, which doesn't seem to be enabled here. The way it worked previously is I guess because it was most likely implied by other avx512 features

I haven't found the exact rustc bug, but it seems this kind of problems is not something new, and better avoided by specifying features explicitly

• Target feature implications for negative features are handled inconsistently between codegen and cfg(target_feature) rust-lang/rust#134792
• #[target_feature(enable = "simd128")] does not work properly on 1.73, but work fine on 1.72.1 rust-lang/rust#116516
• Tests fail with LLVM 19 due to unexpected "'+avx512er' is not a recognized feature for this target (ignoring feature)" output rust-lang/rust#125492
• Implicitly enable evex512 if avx512 is enabled rust-lang/rust#121088

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[CertainLach]

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[CertainLach]

It seems that it was not caused by rustc this time, but incorrect rustc packaging in nixos

This patch can be merged for correctness WRT implied features (avx512f is a part of x86_64-v4 after all), but should not be actually a problem