compile fixes. Vadim ows me a pizza.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2583 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/progdlgg.h

@@ -82,7 +82,7 @@ private:
       Finished             // finished, waiting to be removed from screen
    } m_state;
    /// the abort button (or NULL if none)
-   wxButton *m_btnAbort;
+   class wxButton *m_btnAbort;
    /// the maximum value
    int m_maximum;