[gdk-pixbuf/macos-ci] Don't build docs

[Matthias Clasen <matthiasc src gnome org>]

commit 3b824a92cc65c2419b32ffadc98cddf429ba2f17
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jan 3 16:18:00 2021 -0500

    Don't build docs

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 19e040534..37e10b70f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -63,7 +63,7 @@ macos:
     - pip3 install --user ninja
     - export PATH=/Users/gitlabrunner/Library/Python/3.7/bin:$PATH
   script:
-    - meson setup _build
+    - meson setup -Dintrospection=disabled -Ddocs=false _build
     - meson compile -C_build
   artifacts:
     when: always