Updated doc for wxFileExists()

Corrected redrawing and OpenGl canvas
  Made new font code in utilsunix compile (Why does
    Vadim never need any headers?)


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3790 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/unix/utilsunx.cpp

@@ -586,6 +586,9 @@ void wxFatalError( const wxString &msg, const wxString &title )
         XFreeFont((Display *)wxGetDisplay(), font);
     }
 #elif defined(__WXGTK__)
+
+    #include "gdk/gdk.h"
+
     static inline wxNativeFont wxLoadFont(const wxString& fontSpec)
     {
         return gdk_font_load( wxConvCurrent->cWX2MB(fontSpec) );