[metacity/ci] update .gitlab-ci.yml

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 914be6bf3f90db55444ac3d18e003dac40348680
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Sep 2 03:48:38 2018 +0300

    update .gitlab-ci.yml

 .gitlab-ci.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 00618964..0356c7dc 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -21,6 +21,7 @@ build-ubuntu:
                       libpango1.0-dev
                       libsm-dev
                       libstartup-notification0-dev
+                      libtool
                       libvulkan-dev
                       libx11-dev
                       libxcomposite-dev
@@ -37,4 +38,4 @@ build-ubuntu:
   script:
     - ./autogen.sh
     - make
-    - make distcheck
\ No newline at end of file
+    - make distcheck