fixed memory leak in wxNativeFontInfo when using Pango

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28146 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/fontutil.h

@@ -135,6 +135,11 @@ public:
     // default ctor (default copy ctor is ok)
     wxNativeFontInfo() { Init(); }
 
+#if wxUSE_PANGO
+    wxNativeFontInfo(const wxNativeFontInfo& info);
+    ~wxNativeFontInfo();
+#endif
+
     // reset to the default state
     void Init();