Update x86 CPU_TARGETS

[vchuravy]

We still have: generic;sandybridge,-xsaveopt,clone_all;haswell,-rdrnd,base(1) Haswell is now almost 10 year old.

julia-buildkite/utilities/build_envs.sh

Line 30 in d238857

"haswell,-rdrnd,base(1)"

GCC defined x86_64-v1 to v4 https://gitlab.com/x86-psABIs/x86-64-ABI/-/commit/77566eb03bc6a326811cb7e9

x86-64: CMOV, CMPXCHG8B, FPU, FXSR, MMX, FXSR, SCE, SSE, SSE2
x86-64-v2: (close to Nehalem) CMPXCHG16B, LAHF-SAHF, POPCNT, SSE3, SSE4.1, SSE4.2, SSSE3
x86-64-v3: (close to Haswell) AVX, AVX2, BMI1, BMI2, F16C, FMA, LZCNT, MOVBE, XSAVE
x86-64-v4: AVX512F, AVX512BW, AVX512CD, AVX512DQ, AVX512VL

Instead of using the levels we could add Skylake and Zen