[gnome-mud] ci: Add GCC installation

[Mart Raudsepp <mraudsepp src gnome org>]

commit d1dc11b4e6605be58ffe8bc7e6784f3bef471d2e
Author: Mart Raudsepp <leio gentoo org>
Date:   Fri Jan 4 22:44:39 2019 +0200

    ci: Add GCC installation
    
    GCC used to be installed as a dep of "make" apparently, but not
    with meson; so add it for now (and we can look at building a
    pipeline with clang later).

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index aa7c2bf..945b4c8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,7 +4,7 @@ stages:
   - build
 
 before_script:
-  - dnf install -y glib2-devel gstreamer1-devel
+  - dnf install -y gcc glib2-devel gstreamer1-devel
                    meson vte291-devel which
 
 build_gnome_mud: