5d399f9f3d build: remove native B2 package (fanquake) 2037a3b6c1 build: header-only Boost (fanquake) 39e66e938f build: use header-only Boost unit test (fanquake) Pull request description: This PR converts our Boost usage to header only. We switch from using our last remaining Boost lib (unit test), to using it's header-only implementation (see https://www.boost.org/doc/libs/1_78_0/libs/test/doc/html/boost_test/adv_scenarios/single_header_customizations/multiple_translation_units.html). Also related to #24291. Guix build: ```bash ``` ACKs for top commit: hebasto: re-ACK 5d399f9f3d MarcoFalke: approach ACK 5d399f9f3d 📞 Tree-SHA512: e60835ee9c11aa941a64679616da2002d6cd86e464895372fafdd42ad6499d7eb1dde6f0013c60adaeb97bd191198430cb158a7a7417b38080dd7106b28e3ba5
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