[gnome-build-meta] world/polari.bst: Add missing itstool dependency

[Jürg Billeter <juergbi src gnome org>]

commit b87402249b0bb45a1e64ebc0e0471c1dc15b0754
Author: Jürg Billeter <j bitron ch>
Date:   Sun Feb 10 10:34:52 2019 +0100

    world/polari.bst: Add missing itstool dependency
    
        FileNotFoundError: [Errno 2] No such file or directory: 'itstool': 'itstool'

 elements/world/polari.bst | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/elements/world/polari.bst b/elements/world/polari.bst
index edc76576..ce1b6132 100644
--- a/elements/world/polari.bst
+++ b/elements/world/polari.bst
@@ -11,5 +11,7 @@ depends:
 - sdk/gobject-introspection.bst
 - sdk/gtk+-3.bst
 - world/telepathy-glib.bst
+- filename: desktop/itstools.bst
+  junction: freedesktop-sdk.bst
 - filename: base.bst
   junction: freedesktop-sdk.bst