meson: re-attach rule-syntax-check.py test

meson: re-attach rule-syntax-check.py test

 39/248 rule-syntax-check                       OK     0.07 s

--- command ---
/home/zbyszek/src/systemd-work/test/rule-syntax-check.py \
    /home/zbyszek/src/systemd-work/build/../rules/60-block.rules \
    /home/zbyszek/src/systemd-work/build/../rules/60-cdrom_id.rules \
    /home/zbyszek/src/systemd-work/build/../rules/60-drm.rules \
    /home/zbyszek/src/systemd-work/build/../rules/60-evdev.rules \
    /home/zbyszek/src/systemd-work/build/../rules/60-input-id.rules \
    /home/zbyszek/src/systemd-work/build/../rules/60-persistent-alsa.rules \
    /home/zbyszek/src/systemd-work/build/../rules/60-persistent-input.rules \
    /home/zbyszek/src/systemd-work/build/../rules/60-persistent-storage.rules \
    /home/zbyszek/src/systemd-work/build/../rules/60-persistent-storage-tape.rules \
    /home/zbyszek/src/systemd-work/build/../rules/60-persistent-v4l.rules \
    /home/zbyszek/src/systemd-work/build/../rules/60-sensor.rules \
    /home/zbyszek/src/systemd-work/build/../rules/60-serial.rules \
    /home/zbyszek/src/systemd-work/build/../rules/70-joystick.rules \
    /home/zbyszek/src/systemd-work/build/../rules/70-mouse.rules \
    /home/zbyszek/src/systemd-work/build/../rules/70-touchpad.rules \
    /home/zbyszek/src/systemd-work/build/../rules/75-net-description.rules \
    /home/zbyszek/src/systemd-work/build/../rules/75-probe_mtd.rules \
    /home/zbyszek/src/systemd-work/build/../rules/78-sound-card.rules \
    /home/zbyszek/src/systemd-work/build/../rules/80-drivers.rules \
    /home/zbyszek/src/systemd-work/build/../rules/80-net-setup-link.rules \
    /home/zbyszek/src/systemd-work/build/rules/50-udev-default.rules \
    /home/zbyszek/src/systemd-work/build/rules/64-btrfs.rules \
    /home/zbyszek/src/systemd-work/build/rules/99-systemd.rules
--- stdout ---
...
-------

It got dropped by mistake in 72cdb3e783174dcf9223a49f03e3b0e2ca95ddb8.