Make Kit::makeSticky method public

This method is needed by plugins (ex. qnx) that provides
auto detected kits to prevent kit's information
from any unwanted changes.

Change-Id: I6f0b36983436890aef62f5204d0f8a51d5e645fb
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/projectexplorer/kit.h

@@ -100,11 +100,11 @@ public:
     void copyFrom(const Kit *k);
 
     void setAutoDetected(bool detected);
+    void makeSticky();
+    void makeSticky(Core::Id id);
 
 private:
     void setSdkProvided(bool sdkProvided);
-    void makeSticky();
-    void makeSticky(Core::Id id);
 
     ~Kit();