string_view: add missing licence for capacity libcxx test

[KFilipek]

• add missing Intel licence

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This change is 

[lukaszstolarczuk]

Reviewed 1 of 1 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved

[codecov]

Codecov Report

Merging #947 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #947      +/-   ##
==========================================
- Coverage   95.91%   95.87%   -0.04%     
==========================================
  Files          48       48              
  Lines        6138     6138              
==========================================
- Hits         5887     5885       -2     
- Misses        251      253       +2     

Flag	Coverage Δ
#tests_clang_debug_cpp17	95.84% <ø> (ø)
#tests_gcc_debug	92.31% <ø> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
...j++/container/detail/concurrent_skip_list_impl.hpp	97.99% <0.00%> (-0.14%)	⬇️
...ude/libpmemobj++/container/concurrent_hash_map.hpp	93.26% <0.00%> (-0.11%)	⬇️

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