tests/thirdparty: re-enable segmentio/asm

[mmcloughlin]

Fixes #229

[codecov-commenter]

Codecov Report

Merging #232 (8935082) into master (68350e4) will decrease coverage by 0.34%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #232      +/-   ##
==========================================
- Coverage   76.16%   75.82%   -0.35%     
==========================================
  Files          65       65              
  Lines       20526    20526              
==========================================
- Hits        15633    15563      -70     
- Misses       4814     4888      +74     
+ Partials       79       75       -4     

Flag	Coverage Δ
integration	11.84% <ø> (ø)
unittests	72.92% <ø> (-0.35%)	⬇️

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Impacted Files	Coverage Δ
examples/md5x16/md5x16.go	0.00% <0.00%> (-86.42%)	⬇️

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