[gnome-builder] todo: set TAGS_FILES automake variable

[Christian Hergert <chergert src gnome org>]

commit bbb81bd2d417b9db00223a38cb34d53059fab5a1
Author: Christian Hergert <chergert redhat com>
Date:   Tue Oct 18 20:19:59 2016 -0700

    todo: set TAGS_FILES automake variable
    
    This ensures that the files have tags built for them.

 plugins/todo/Makefile.am |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/plugins/todo/Makefile.am b/plugins/todo/Makefile.am
index 28b5708..b7eae45 100644
--- a/plugins/todo/Makefile.am
+++ b/plugins/todo/Makefile.am
@@ -8,6 +8,8 @@ dist_plugin_DATA = todo.plugin
 moduledir = $(libdir)/gnome-builder/plugins/todo_plugin
 dist_module_DATA = todo_plugin/__init__.py
 
+TAGS_FILES = $(dist_module_DATA)
+
 endif
 
 -include $(top_srcdir)/git.mk