[gtk/matthiasc/for-master] ci: Build Broadway on MacOS

[Matthias Clasen <matthiasc src gnome org>]

commit fb052c8d2546706b49e5adb87bc88ad600f31752
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Jun 18 06:08:32 2021 -0700

    ci: Build Broadway on MacOS
    
    We've seen a build failure if Broadway is built without
    the X11 backend. Lets recreate that configuration in ci
    so it doesn't break again.

 .gitlab-ci.yml | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 026e5fe95c..c100755896 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -170,6 +170,8 @@ macos:
     - export MESON_FORCE_BACKTRACE=1
   script:
     - meson -Dx11-backend=false
+            -Dbroadway-backend=true
+            -Dmacos-backend=true
             -Dintrospection=disabled
             -Dcpp_std=c++11
             -Dpixman:tests=disabled