Fixed missing override keywords

Summary: Fixed GCC 6.3 missing override warnings.

Reviewers: #swift_pilot_client, rwinklmeier

Reviewed By: #swift_pilot_client, rwinklmeier

Subscribers: jenkins

Tags: #swift_pilot_client

Differential Revision: https://dev.swift-project.org/D27

samples/cliclient/reader.h

@@ -36,7 +36,7 @@ namespace BlackSample
 
     protected:
         //! Run reader in background
-        void run();
+        virtual void run() override;
 
     signals:
         //! User command

samples/weatherdata/reader.h

@@ -31,7 +31,7 @@ public:
 
 protected:
     //! \copydoc QThread::run
-    void run();
+    virtual void run() override;
 
 signals:
     //! User is asking for weather data