[skip ci] fix some warnings:

-Wunused-parameter
-Winconsistent-missing-override

src/Gui/DlgUnitsCalculatorImp.cpp

@@ -98,6 +98,7 @@ void DlgUnitsCalculator::reject()
 
 void DlgUnitsCalculator::textChanged(QString unit)
 {
+    Q_UNUSED(unit)
     valueChanged(actValue);
 }
 

src/Mod/TechDraw/App/DrawProjGroup.h

@@ -174,7 +174,7 @@ protected:
     Base::Vector3d dir2vec(gp_Dir d);
     gp_Dir vec2dir(Base::Vector3d v);
 
-    virtual void handleChangedPropertyType(Base::XMLReader &reader, const char *TypeName, App::Property * prop);
+    virtual void handleChangedPropertyType(Base::XMLReader &reader, const char *TypeName, App::Property * prop) override;
 
 };