feature/spaceship: Clause 17: Feature-test macro, yvals_core.h comment #1672
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Works towards #62.
This adds P1614R2 Adding Spaceship
<=>To The Library toyvals_core.h's list of_HAS_CXX20features, and increases the value of the feature-test macro as specified in WG21-N4878 (see SD-FeatureTest to double-check). The feature-test macro remains additionally guarded by__cpp_lib_concepts. Finally, this updates the test accordingly, and unskips libcxx's test.After this PR, the only remaining work for Clause 17 Language Support is #489 (where we need compiler support).