[gnome-mahjongg] snap: add gettext to build-packages

[Jeremy Bicha <jbicha src gnome org>]

commit c97ee3a9d83f7d2c28eb8942a9da23addf560f45
Author: Jeremy Bicha <jbicha ubuntu com>
Date:   Fri Feb 1 13:27:55 2019 -0500

    snap: add gettext to build-packages

 snap/snapcraft.yaml | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/snap/snapcraft.yaml b/snap/snapcraft.yaml
index d1603ec..ce9a835 100644
--- a/snap/snapcraft.yaml
+++ b/snap/snapcraft.yaml
@@ -65,6 +65,7 @@ parts:
     organize:
       snap/gnome-mahjongg/current/usr: usr
     build-packages:
+      - gettext
       - itstool
       - libglib2.0-dev
       - libgtk-3-dev