cpu dispatch: detect BMI2 and POPCNT automatically

[voutcn]

No description provided.

[codecov]

Codecov Report

Merging #208 into master will decrease coverage by 0.11%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #208      +/-   ##
==========================================
- Coverage   85.99%   85.87%   -0.12%     
==========================================
  Files          89       90       +1     
  Lines        6197     6203       +6     
==========================================
- Hits         5329     5327       -2     
- Misses        868      876       +8

Impacted Files	Coverage Δ
src/utils/cpu_dispatch.h	100% <100%> (ø)
src/main.cpp	72.22% <100%> (+1.63%)	⬆️
src/cx1/cx1_kmer_count.cpp	87.53% <0%> (-2.24%)	⬇️
src/idba/hash_graph.cpp	98.55% <0%> (-1.45%)	⬇️

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