Support hyphenated ROSIDL subdirs #230

Job	Run time
build-and-test / build (24.X, rolling)	7m 39s
build-and-test / build (24.X, jazzy)	12m 25s
build-and-test / build (24.X, humble)	8m 5s
build-and-test / build (24.X, kilted)	9m 3s
	37m 12s

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