[pygobject] CI: pass -Wno-error=deprecated-declarations for MSYS2

[Christoph Reiter <creiter src gnome org>]

commit 5465ff577c4b55979ce424f1811257ac92f78bcd
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Sat Mar 26 21:04:14 2022 +0100

    CI: pass -Wno-error=deprecated-declarations for MSYS2
    
    There are some glib deprecations that need fixing, but let's get
    CI green again first.

 .gitlab-ci/test-msys2.sh | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/.gitlab-ci/test-msys2.sh b/.gitlab-ci/test-msys2.sh
index 8fc42146..8cd39afd 100755
--- a/.gitlab-ci/test-msys2.sh
+++ b/.gitlab-ci/test-msys2.sh
@@ -32,6 +32,9 @@ COV_KEY="${CI_JOB_NAME}"
 mkdir -p "${COV_DIR}"
 export COVERAGE_FILE="${COV_DIR}/.coverage.${COV_KEY}"
 
+# FIXME: g_callable_info_free_closure etc
+CFLAGS+=" -Wno-error=deprecated-declarations"
+
 # https://docs.python.org/3/using/cmdline.html#envvar-PYTHONDEVMODE
 export PYTHONDEVMODE=1