[gnome-builder] po: update POTFILES.skip

[Christian Hergert <chergert src gnome org>]

commit 74203861cc7976c0766d90688237b183e0adf7d6
Author: Christian Hergert <christian hergert me>
Date:   Tue May 12 17:13:41 2015 -0700

    po: update POTFILES.skip

 po/POTFILES.skip |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/po/POTFILES.skip b/po/POTFILES.skip
index fa9bc83..da0efef 100644
--- a/po/POTFILES.skip
+++ b/po/POTFILES.skip
@@ -8,3 +8,4 @@ contrib/egg/egg-signal-group.c
 contrib/egg/egg-signal-group.h
 contrib/egg/egg-state-machine.c
 contrib/egg/egg-state-machine.h
+contrib/egg/egg-task-cache.c