unused parameter warning fixes for --disable-all-features build

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@49829 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/bitmap.cpp

@@ -701,6 +701,9 @@ bool wxBitmap::SaveFile( const wxString &name, wxBitmapType type, const wxPalett
     wxImage image = ConvertToImage();
     return image.Ok() && image.SaveFile(name, type);
 #else // !wxUSE_IMAGE
+    wxUnusedVar(name);
+    wxUnusedVar(type);
+
     return false;
 #endif // wxUSE_IMAGE
 }