refactor: remove C++17 workarounds #942

Job	Run time
Build Image	6m 26s
Build Dependencies (arm-linux, arm-linux-gnueabihf)	52m 44s
Build Dependencies (linux64, x86_64-pc-linux-gnu)	14m 13s
Build Dependencies (linux64_tsan, x86_64-pc-linux-gnu)	47m 3s
Build Dependencies (linux64_ubsan, x86_64-pc-linux-gnu)	56m 3s
Build Dependencies (linux64_fuzz, x86_64-pc-linux-gnu)	49m 5s
Build Dependencies (linux64_cxx20, x86_64-pc-linux-gnu)	22m 15s
Build Dependencies (linux64_sqlite, x86_64-pc-linux-gnu)	14m 7s
Build Dependencies (linux64_nowallet, x86_64-pc-linux-gnu)	13m 52s
Build (arm-linux, arm-linux-gnueabihf)	12m 54s
Build (linux64, x86_64-pc-linux-gnu)	2m 25s
Build (linux64_tsan, x86_64-pc-linux-gnu)	2m 45s
Build (linux64_ubsan, x86_64-pc-linux-gnu)	10m 50s
Build (linux64_fuzz, x86_64-pc-linux-gnu)	6m 14s
Build (linux64_cxx20, x86_64-pc-linux-gnu)	11m 45s
Build (linux64_sqlite, x86_64-pc-linux-gnu)	2m 31s
Build (linux64_nowallet, x86_64-pc-linux-gnu)	10m 59s
	5h 36m 11s

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