Added a few #if wxUSE_XXX

Regrouped image format handlers
  Updated the rest accordingly
  Added changes.txt for wxGTK


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2795 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/progdlgg.cpp

@@ -31,6 +31,8 @@
 #include "wx/intl.h"
 #endif
 
+#if wxUSE_PROGRESSDLG
+
 #include "wx/generic/progdlgg.h"
 
 #define LAYOUT_X_MARGIN 8
@@ -172,3 +174,5 @@ wxProgressDialog::~wxProgressDialog()
    else
       wxEnableTopLevelWindows(TRUE);
 }
+
+#endif