[test] do not link with yaml-cpp or libyaml

[biojppm]

No description provided.

[codecov]

Codecov Report

Merging #177 (04af04e) into master (8a624dc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #177   +/-   ##
=======================================
  Coverage   96.35%   96.35%           
=======================================
  Files          63       63           
  Lines       12843    12843           
=======================================
  Hits        12375    12375           
  Misses        468      468           

Impacted Files	Coverage Δ
test/test_case.hpp	36.11% <ø> (ø)
test/test_double_quoted.cpp	100.00% <ø> (ø)
test/test_github_issues.cpp	95.58% <ø> (ø)
test/test_group.cpp	98.12% <ø> (ø)
test/test_plain_scalar.cpp	100.00% <ø> (ø)
test/test_scalar_names.cpp	100.00% <ø> (ø)
test/test_simple_map.cpp	100.00% <ø> (ø)
test/test_simple_seq.cpp	100.00% <ø> (ø)

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