Compilation failure due to deprecated packed_simd

[nbaztec]

🐛 Bug Report

era-boojum uses the currently deprecated https://github.com/rust-lang/packed_simd which can no longer be compiled with recent rust versions.

📝 Description

era-boojum uses the currently deprecated https://github.com/rust-lang/packed_simd which had its last update some 10 months ago. The project maintainer has deprecated it in favor of std::simd. During this time several of the features have been removed from the rust compiler, (std_simd, platform_intrinsics, etc.). Thus the package can no longer be compiled with latest rust stable (v1.78) or any subsequent nightlies.

Related errors
rust-lang/packed_simd#359
rust-lang/packed_simd#360

🔄 Reproduction Steps

Compile with rustc 1.78.0 (9b00956e5 2024-04-29) to observe compilation failures citing deprecated features

🤔 Expected Behavior

Module should compile with latest stable rust.

😯 Current Behavior

Compilation fails