[gegl] ci: install vala package for babl build

[Øyvind "pippin" Kolås <ok src gnome org>]

commit c01a38120f86d77736a680cc5afacd848c0b9ebe
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue May 5 14:01:18 2020 +0200

    ci: install vala package for babl build

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8ae41ea02..6e5e0f1a8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -49,7 +49,7 @@ build-image:
     GIT_DEPTH: "5"
     CCACHE_MAXSIZE: "32Mi"
   before_script:
-    - pacman -Syu --noconfirm --needed --cachedir $PACMAN_CACHE git base-devel ccache meson lcms2 
gobject-introspection
+    - pacman -Syu --noconfirm --needed --cachedir $PACMAN_CACHE git base-devel ccache meson lcms2 
gobject-introspection vala
     - git clone --depth=$GIT_DEPTH https://gitlab.gnome.org/GNOME/babl.git _babl
     - cd _babl
     - ccache -z