[cantarell-fonts/add-ci] Do not explicitly install ninja

[Nikolaus Waxweiler <nwaxweiler src gnome org>]

commit 826334442d9ebed36a12025befb47f96d8e7de30
Author: Nikolaus Waxweiler <madigens gmail com>
Date:   Fri May 25 22:03:54 2018 +0100

    Do not explicitly install ninja

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 025373c9..1e52f186 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -2,7 +2,7 @@ image: registry.gitlab.gnome.org/gnome/gnome-runtime-images/base:latest
 
 build:
   script:
-    - dnf install -y python3-devel gcc redhat-rpm-config meson ninja
+    - dnf install -y python3-devel gcc redhat-rpm-config meson
     - pip3 install fontmake git+https://github.com/adobe-type-tools/psautohint.git@v1.1.0#egg=psautohint
     - meson build
     - ninja -C build dist