the workflow of "Tests (clang++-18, C++23, release, --enable-dpdk) fails due to dpdk build failure about seastar

[avikivity]

Likely due to some translation units compiled with -march=native and some not.

[tchaikov]

Likely due to some translation units compiled with -march=native and some not.

the building host is not able to execute AVX-10 instructions, so -march=native disables -mevex512. while the Clang used to build Seastar on the building host is able to emit AVX-10.512 instructions. so, when building intrinsics which require -mevex512 or equivalent options with -march=native, the compiler fails.

[tchaikov]

we can revert the fix of ba395a2 if we can use clang 18.1.6. see https://github.com/llvm/llvm-project/releases/tag/llvmorg-18.1.6

This patch fixes build failures when compiling AVX512 code using -march=native on machines without AVX512. The problem was introduced by llvm/llvm-project@a7b8b89 which is included in LLVM 18.1.5 release.