use more wxOVERRIDE (#329)

include/wx/fontmap.h

@@ -202,7 +202,7 @@ public:
     // returns the encoding for the given charset (in the form of RFC 2046) or
     // wxFONTENCODING_SYSTEM if couldn't decode it
     virtual wxFontEncoding CharsetToEncoding(const wxString& charset,
-                                             bool interactive = true);
+                                             bool interactive = true) wxOVERRIDE;
 
     // find an alternative for the given encoding (which is supposed to not be
     // available on this system). If successful, return true and fill info
@@ -242,7 +242,7 @@ public:
     static wxFontMapper *Get();
 
     // pseudo-RTTI since we aren't a wxObject.
-    virtual bool IsDummy() { return false; }
+    virtual bool IsDummy() wxOVERRIDE { return false; }
 
 protected:
     // GetAltForEncoding() helper: tests for the existence of the given