Build

use new assigned_unit API for 51.11 #5750

Job	Run time
lint / lint	1m 16s
docs / Build linux64	1m 17s
test / Windows MSVC / Build win64	5m 44s
test / Linux gcc-12 / Build linux64	1m 49s
test / Linux gcc-10 / Build linux64	1m 31s
test / Run Linux test suite / Test (ubuntu, gcc-10, default plugins, default config)	51s
test / Run Linux test suite (gcc-12, all plugins) / Test (ubuntu, gcc-12, all plugins, default config)	47s
test / Run Windows test suite / Test (windows, msvc, default plugins, default config)	55s
test / Run Windows test suite (empty config) / Test (windows, msvc, default plugins, empty config)	1m 6s
	15m 16s

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