[gegl] Remove unused function in operation_reference.c

[Daniel Sabo <daniels src gnome org>]

commit 44d1f6e7d815305fbab34f277fdba5d8fa6d5969
Author: Daniel Sabo <DanielSabo gmail com>
Date:   Tue Nov 19 16:59:00 2013 -0800

    Remove unused function in operation_reference.c

 tools/operation_reference.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/tools/operation_reference.c b/tools/operation_reference.c
index 5c7b594..35ee486 100644
--- a/tools/operation_reference.c
+++ b/tools/operation_reference.c
@@ -269,6 +269,7 @@ static void category_index (gpointer key,
   g_print ("<div style='clear:both;'></div></div>\n");
 }
 
+#if 0
 static void category_menu_index (gpointer key,
                                  gpointer value,
                                  gpointer user_data)
@@ -288,6 +289,7 @@ static void category_menu_index (gpointer key,
       g_print ("<li><a href='#op_%s'>%s</a></li>\n", klass->name, klass->name);
     }
 }
+#endif
 
 /* convert operation name to path of example image */
 static gchar*