[gnome-panel] ci: build with -Werror

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 250fc0c251febdc08f76d46bcb414192418b16a0
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Mar 8 16:21:41 2020 +0200

    ci: build with -Werror

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a49328306..67a0ae73f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -42,7 +42,7 @@ build-ubuntu:
                       pkg-config
                       yelp-tools
   script:
-    - ./autogen.sh --disable-Werror
+    - ./autogen.sh
     - make
     - make distcheck