Enforce `@TargetLocations` meta-annotation #630

Job	Run time
build (cfi-tests, 8)	6m 7s
build (cfi-tests, 11)	5m 56s
build (cfi-tests, 17)	7m 7s
build (downstream-ontology, 8)	6m 20s
build (downstream-ontology, 11)	8m 23s
build (downstream-ontology, 17)	6m 11s
build (downstream-security-demo, 8)	6m 23s
build (downstream-security-demo, 11)	5m 56s
build (downstream-security-demo, 17)	7m 39s
build (downstream-universe, 8)	5m 19s
build (downstream-universe, 11)	7m 5s
build (downstream-universe, 17)	7m 5s
	1h 19m 31s

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