fix: disable library if AVX is missing

[bdraco]

HAS_MISSING_AVX is True if AVX is not supported and using x86_64.

This is a workaround to disable zlib-ng on x86_64 if AVX is not supported
on older CPUs until pycompression/python-zlib-ng#15
is merged and released.

See home-assistant/core#105254

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (8a905f3) 94.44% compared to head (2b5d79b) 82.35%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/aiohttp_zlib_ng/__init__.py	87.50%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #4       +/-   ##
===========================================
- Coverage   94.44%   82.35%   -12.10%     
===========================================
  Files           1        1               
  Lines          18       34       +16     
  Branches        4        7        +3     
===========================================
+ Hits           17       28       +11     
- Misses          0        4        +4     
- Partials        1        2        +1     

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