remove ModUtils.uniqueConcat in favor of Array.uniqueConcat

Change-Id: Ia74e0733006066529f1c257f1f1ebab7446a7142
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
fix duplicate arguments in linker command line

Task-number: QBS-501

Change-Id: I103041729bcdef35bd62a3ed8ec9190c684d17b5
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>