[cogl/wip/hadess/automake-1.16] ci: Drop _FORTIFY_SOURCE

[Emmanuele Bassi <ebassi src gnome org>]

commit f63edd39fc3620c1478f132ec62e89d3fbf4de8d
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Jun 4 11:56:02 2020 +0100

    ci: Drop _FORTIFY_SOURCE
    
    Injecting this in the CPPFLAGS gets propagated into the introspection
    build, which is not ideal, and will generate warnings.

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 6dc0dc77..0c54f192 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -38,7 +38,7 @@ build_stable:
     - dnf upgrade -y --nogpgcheck fedora-release fedora-repos*
     - dnf update -y && dnf install -y $DEPENDENCIES
   script:
-    - CPPFLAGS='-D_FORTIFY_SOURCE=2' ./autogen.sh --disable-dependency-tracking --disable-gtk-doc
+    - ./autogen.sh --disable-dependency-tracking --disable-gtk-doc
     - make
     - xvfb-run -a -s "-screen 0 1024x768x24" make check
     - make install