Project: Remove unused Project::requiresTargetPanel(...)

Change-Id: I7a5298edefd7e26841c4070be23534dd33d093cb
Reviewed-by: hjk <hjk@qt.io>

src/plugins/qmakeprojectmanager/qmakeproject.cpp

@@ -1051,11 +1051,6 @@ void QmakeProject::configureAsExampleProject(const QSet<Core::Id> &platforms)
     qDeleteAll(infoList);
 }
 
-bool QmakeProject::requiresTargetPanel() const
-{
-    return !targets().isEmpty();
-}
-
 // All the Qmake run configurations should share code.
 // This is a rather suboptimal way to do that for disabledReason()
 // but more pratical then duplicated the code everywhere