Remove bool CardInstance::hasSubtype(const char * _subtype)

There exists bool CardInstance::hasSubtype(const string& _subtype) and the
const char* version converts _subtype into string deeper in the call
hierarchy anyway. So both methods did the same.

projects/mtg/include/CardPrimitive.h

@@ -101,7 +101,6 @@ public:
     int removeType(string value, int removeAll = 0);
     int removeType(int value, int removeAll = 0);
     bool hasSubtype(int _subtype);
-    bool hasSubtype(const char * _subtype);
     bool hasSubtype(const string& _subtype);
     bool hasType(int _type);
     bool hasType(const char * type);