McuSupport: 2.2 does not use legacy implementation

Change-Id: I77ba78f8997f1727de5b39cc49811e1def4287d5
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/mcusupport/mcusupportoptions.h

@@ -76,6 +76,7 @@ public:
     static void registerExamples();
 
     static const QVersionNumber &minimalQulVersion();
+    static bool isLegacyVersion(const QVersionNumber &version);
 
     void checkUpgradeableKits();
     void populatePackagesAndTargets();