Fails to build with G_DEBUG=fatal-criticals
gtester is currently hitting a critical when generating glib/tests/tmpsample.xml:
[629/1502] Generating glib/tests/tmpsample.xml with a custom command
FAILED: glib/tests/tmpsample.xml
/home/mcatanzaro/.cache/jhbuild/build/glib/glib/gtester -k --quiet --i-know-this-is-deprecated -o glib/tests/tmpsample.xml --test-arg=--gtester-selftest /home/mcatanzaro/.cache/jhbuild/build/glib/glib/gtester
(/home/mcatanzaro/.cache/jhbuild/build/glib/glib/gtester:56694): GLib-CRITICAL **: 13:16:02.900: g_unix_open_pipe: assertion '(flags & (FD_CLOEXEC | O_NONBLOCK)) == flags' failed
When G_DEBUG=fatal-criticals
is used, this fails the build. It's probably caused by !3538 (merged).