cleanup: Remove unused declarations

Change-Id: I3b54cb9f73cb433c71a441a11ddc74cfecdaa1dc

org.eclipse.jgit.ant/src/org/eclipse/jgit/ant/tasks/GitInitTask.java

 import org.apache.tools.ant.Task;
 import org.eclipse.jgit.api.Git;
 import org.eclipse.jgit.api.InitCommand;
-import org.eclipse.jgit.api.errors.JGitInternalException;
 
 /**
  * Create an empty git repository.

org.eclipse.jgit.junit.http/src/org/eclipse/jgit/junit/http/RecordingLogger.java

 		// Ignore (not relevant to test failures)
 	}
 
-	@SuppressWarnings("unused")
 	public void ignore(Throwable arg0) {
 		// Ignore (not relevant to test failures)
 	}

org.eclipse.jgit.storage.dht/src/org/eclipse/jgit/storage/dht/ChunkIndex.java

 		return fmt;
 	}
 
-	@SuppressWarnings("unchecked")
 	private static void sortObjectList(List<? extends PackedObjectInfo> list) {
 		Collections.sort(list);
 	}

org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/DfsInserter.java

 		packOut.write(buf, 0, 12);
 	}
 
-	@SuppressWarnings("unchecked")
 	private void sortObjectsById() {
 		Collections.sort(objectList);
 	}