CMakePM: Filter out utility targets from target configuration list

In the build target list there is no reason to have <target>_autogen
or <target>_autogen_timestamps targets.

Also do not sort the target list, so that the special targets stay
at top (all, clean, install etc)

Change-Id: I3107150bb40d68cc95246d4d09abc300a6e3d3fc
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/cmakeprojectmanager/cmakebuildstep.cpp

@@ -532,8 +532,6 @@ void CMakeBuildStep::recreateBuildTargetsModel()
         if (idx != -1)
             m_buildTargets[idx] = QString("INSTALL");
     }
-
-    targetList.sort();
     targetList.removeDuplicates();
 
     addItem(QString(), true);