Fix missing overrides and redundant virtual

Change-Id: Id2a247b6032602c2295d928067c2462d3f9b5221
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>

src/plugins/mesonprojectmanager/buildoptions.h

@@ -188,7 +188,7 @@ struct ArrayBuildOption : BuildOption
     }
     Type type() const override { return Type::array; }
     BuildOption *copy() const override { return new ArrayBuildOption{*this}; }
-    inline virtual QString mesonArg() const override
+    inline QString mesonArg() const override
     {
         return QString("-D%1=[%2]").arg(fullName()).arg(quoteAll(m_currentValue).join(','));
     }

src/plugins/mesonprojectmanager/mesontoolkitaspect.cpp

@@ -63,12 +63,12 @@ public:
         setup(k);
     }
 
-    KitAspect *createKitAspect(Kit *k) const
+    KitAspect *createKitAspect(Kit *k) const override
     {
         return new ToolKitAspectWidget{k, this, ToolKitAspectWidget::ToolType::Meson};
     }
 
-    ItemList toUserOutput( const Kit *k) const
+    ItemList toUserOutput(const Kit *k) const override
     {
         const auto tool = MesonToolKitAspect::mesonTool(k);
         if (tool)

src/plugins/mesonprojectmanager/ninjatoolkitaspect.cpp

@@ -64,7 +64,7 @@ public:
         setup(k);
     }
 
-    ItemList toUserOutput( const Kit *k) const
+    ItemList toUserOutput(const Kit *k) const override
     {
         const auto tool = NinjaToolKitAspect::ninjaTool(k);
         if (tool)