[cantarell-fonts/add-ci] Install gcc for psautohint

[Nikolaus Waxweiler <nwaxweiler src gnome org>]

commit f4c41ba17efb7a2e5553dde0bcc12acb0bd9ba8e
Author: Nikolaus Waxweiler <madigens gmail com>
Date:   Fri May 25 21:46:46 2018 +0100

    Install gcc for psautohint

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 7791aac0..036be718 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-pip
+    - dnf install -y python3-pip gcc
     - pip3 install fontmake git+https://github.com/adobe-type-tools/psautohint.git@v1.1.0#egg=psautohint
     - meson build
     - ninja -C build dist