[tracker] Add empty ontology-sections.txt.

[Carlos Garnacho <carlosg src gnome org>]

commit 28082f35ac62dbde7f7b892ba964cb23c3b6131b
Author: Carlos Garnacho <carlos lanedo com>
Date:   Thu Dec 17 14:33:28 2009 +0100

    Add empty ontology-sections.txt.
    
    Looks like some gtk-doc versions really like this file, so build breaks
    if it isn't there.

 0 files changed, 0 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/ontology/ontology-sections.txt b/docs/reference/ontology/ontology-sections.txt
new file mode 100644
index 0000000..e69de29