[glom] Fix a warning

[Murray Cumming <murrayc src gnome org>]

commit 6d27a97330c0b608214d7bd66fe49dc5e2ad6ec9
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Feb 24 13:38:32 2012 +0100

    Fix a warning

 glom/libglom/db_utils.cc |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/glom/libglom/db_utils.cc b/glom/libglom/db_utils.cc
index 37d018a..757ea31 100644
--- a/glom/libglom/db_utils.cc
+++ b/glom/libglom/db_utils.cc
@@ -960,7 +960,7 @@ type_vec_fields get_fields_for_table_from_database(const Glib::ustring& table_na
 }
 
 //TODO: This is very inefficient, because it is 
-type_vec_fields get_fields_for_table(const Document* document, const Glib::ustring& table_name, bool including_system_fields)
+type_vec_fields get_fields_for_table(const Document* document, const Glib::ustring& table_name, bool /* including_system_fields */)
 {
   //We could also get the field definitions from the database:
   //But that is inefficient because this method is called so often,