Remove unnecessary destructors

Change-Id: Id0bc2d3a305e6af24838266195ab22e04e3a12a1
Reviewed-by: Niels Weber <niels.weber@theqtcompany.com>

src/plugins/genericprojectmanager/genericmakestep.cpp

@@ -94,10 +94,6 @@ void GenericMakeStep::ctor()
                                                       GENERIC_MS_DISPLAY_NAME));
 }
 
-GenericMakeStep::~GenericMakeStep()
-{
-}
-
 bool GenericMakeStep::init()
 {
     BuildConfiguration *bc = buildConfiguration();