[nasa/cryptolib#449] remove KMC_CFFI_EXCLUDE

[Donnie-Ice]

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Hayk specifically requested this, so we should be good to merge it

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.99%. Comparing base (c42bed7) to head (dbad95d).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #450   +/-   ##
=======================================
  Coverage   74.99%   74.99%           
=======================================
  Files          80       80           
  Lines       23341    23341           
  Branches     1872     1872           
=======================================
  Hits        17505    17505           
  Misses       5168     5168           
  Partials      668      668           

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