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Fix Gradle source root in included builds and index Java in Android m… #393

Job	Run time
Build scip-java CLI	4m 3s
gradle-kotlin-kotlinpoet	3m 16s
gradle-kotlin-kotlinconf-app	5m 32s
gradle-java21-readiness	1m 25s
gradle-mixed-kotlinpoet	3m 55s
maven-java25-demo	1m 24s
bazel-java-examples	2m 7s
maven-java17-spring-boot	2m 37s
maven-kotlin-json-kotlin-maven	2m 47s
Repository indexing pass	3s
	27m 9s