efl - fix threadqueue spinlock destruction on openbsd - doesn't like it

so the spinlock on the threadqueue block pool it taken on shutdownn,
while the block pool is freed up then its is destroyed, but openbsd
very much doesnt like this and returns an error, so release the lock
before destroying it.

@fix

src/lib/eina/eina_thread_queue.c

@@ -171,6 +171,7 @@ _eina_thread_queue_msg_block_pool_shutdown(void)
              _eina_thread_queue_block_pool = blknext;
           }
      }
+   eina_spinlock_release(&(_eina_thread_queue_block_pool_lock));
    eina_spinlock_free(&_eina_thread_queue_block_pool_lock);
 }