Replace slots with Q_SLOTS

ext/libstrawberry-common/core/messagehandler.h

@@ -50,7 +50,7 @@ class _MessageHandlerBase : public QObject {
   // After this is true, messages cannot be sent to the handler any more.
   bool is_device_closed() const { return is_device_closed_; }
 
- protected slots:
+ protected Q_SLOTS:
   void WriteMessage(const QByteArray &data);
   void DeviceReadyRead();
   virtual void DeviceClosed();

ext/libstrawberry-common/core/workerpool.h

@@ -56,7 +56,7 @@ class _WorkerPoolBase : public QObject {
   // Emitted when a worker failed to start.  This usually happens when the worker wasn't found, or couldn't be executed.
   void WorkerFailedToStart();
 
- protected slots:
+ protected Q_SLOTS:
   virtual void DoStart() {}
   virtual void NewConnection() {}
   virtual void ProcessReadyReadStandardOutput() {}