skip tests if List::MoreUtils is missing #1783

Job	Run time
ubuntu-20.04 + gui tests	5m 30s
Docker tests with debian:jessie	7m 43s
ubuntu-20.04 + mod_perl	5m 6s
Docker tests with debian:stretch	6m 16s
ubuntu-22.04 + gui tests	4m 42s
Docker tests with debian:buster	6m 42s
Docker tests with debian:bullseye	6m 13s
Docker tests with debian:bookworm	6m 12s
Docker tests with ubuntu:bionic	6m 34s
Docker tests with ubuntu:trusty	6m 22s
Docker tests with ubuntu:noble	6m 37s
	1h 7m 57s

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