[gnome-themes-extra/gitlab-ci] Install gnome-common

[Juraj Fiala <jurf src gnome org>]

commit 0135ab8cf8aba3a60048b3438a26a8c6a176968d
Author: Juraj Fiala <jurf riseup net>
Date:   Fri Mar 2 11:52:18 2018 +0000

    Install gnome-common

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c38f953b..3829e0f2 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -9,7 +9,7 @@ build:
   # instead of calling g++ directly you can also use some build toolkit like make
   # install the necessary build tools when needed
   before_script: 
-    - apt update && apt -y install make autoconf 
+    - apt update && apt -y install make autoconf gnome-common
   script: 
     - ./autogen.sh
     - make