[mutter] ci: Increase warnlevel from 1 to 2

[Marge Bot <marge-bot src gnome org>]

commit cccf133f55959e1413f3fe10d338ebfdb23da04a
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Mar 4 21:04:16 2022 +0100

    ci: Increase warnlevel from 1 to 2
    
    This will hopefully catch more things than -Wall.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2319>

 .gitlab-ci.yml | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3d18a75a72..e0231c2dc2 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -214,7 +214,15 @@ check-code-style:
     - .fdo.distribution-image@fedora
   stage: build
   script:
-    - meson . build -Dbuildtype=debugoptimized -Db_coverage=true -Degl_device=true -Dwayland_eglstream=true 
--werror --prefix /usr
+    - meson . build
+        --prefix /usr
+        --werror
+        --fatal-meson-warnings
+        --warnlevel 2
+        -Dbuildtype=debugoptimized
+        -Db_coverage=true
+        -Degl_device=true
+        -Dwayland_eglstream=true
     - meson compile -C build
     - meson install -C build
   artifacts: