meson: fix warnings for extract_all_objects function

The "recursive:" kwarg is available in the targeted minimum version of meson, and is basically required if you want to not emit warnings and maybe error with --fatal-meson-warnings.

The current default behavior is false, so explicitly opt in to that value. None of these internal libraries use recursive objects anyway.

In commit c74d87e4 we went a different route, and upgraded the minimum meson version and dropped the TODO workarounds in these files. But for a stable branch this is not desirable.