Made sorting case-insensitive (to match wxComboBox behavior, backported from SVN trunk)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@61402 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/odcombo.cpp

@@ -506,7 +506,7 @@ int wxVListBoxComboPopup::Append(const wxString& item)
 
         for ( i=0; i<strings.GetCount(); i++ )
         {
-            if ( item.Cmp(strings.Item(i)) < 0 )
+            if ( item.CmpNoCase(strings.Item(i)) < 0 )
             {
                 pos = (int)i;
                 break;