[gnome-builder] fix annoying potfiles check

[Christian Hergert <chergert src gnome org>]

commit 7e645d7d1da6af72fda2ed9a71a107c13b7ac26f
Author: Christian Hergert <christian hergert me>
Date:   Thu Apr 28 02:21:57 2016 -0700

    fix annoying potfiles check

 po/POTFILES.skip |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/po/POTFILES.skip b/po/POTFILES.skip
index 7b94311..d1de359 100644
--- a/po/POTFILES.skip
+++ b/po/POTFILES.skip
@@ -13,3 +13,4 @@ tools/ide-list-files.c
 tools/ide-mine-projects.c
 tools/ide-search.c
 data/org.gnome.Builder.desktop.in
+sub/data/org.gnome.Builder.desktop.in