Merge pull request #1022 from yh-semmle/java/dead-code-override

Java: respect override annotations in `java/unused-parameter`

java/ql/src/semmle/code/java/deadcode/DeadCode.qll

@@ -296,6 +296,8 @@ class RootdefCallable extends Callable {
     // Methods that are the target of a member reference need to implement
     // the exact signature of the resulting functional interface.
     exists(MemberRefExpr mre | mre.getReferencedCallable() = this)
+    or
+    this.getAnAnnotation() instanceof OverrideAnnotation
   }
 }