- fixes crash on giving banned skills to hero (partial #1427)

- fixes hover text for prisons - they should not display name of imprisoned hero
- missing bits for launcher, Linux-specific

lib/CObjectHandler.h

@@ -431,6 +431,7 @@ public:
 
 	void initObj() override;
 	void onHeroVisit(const CGHeroInstance * h) const override;
+	const std::string & getHoverText() const override;
 protected:
 	void setPropertyDer(ui8 what, ui32 val) override;//synchr
 };