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Fix building of `magit`, `transient` and `with-editor` #246

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Run time

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Job	Run time
build (24.3)	38s
build (24.5)	27s
build (25.3)	26s
build (26.3)	27s
build (27.2)	34s
build (28.2)	27s
build (snapshot)	26s
	3m 25s