HACK: Disable fatal compiler warnings on Gentoo #968

Job	Run time
OS (apt-docker.io/amd64/ubuntu:devel)	2m 25s
OS (apt-docker.io/amd64/ubuntu:latest)	2m 20s
OS (apt-docker.io/amd64/ubuntu:rolling)	1m 47s
OS (apt-docker.io/i386/debian:testing)	1m 47s
OS (apt-docker.io/amd64/debian:testing)	1m 57s
OS (dnf-registry.fedoraproject.org/fedora:latest)	2m 53s
OS (dnf-registry.fedoraproject.org/fedora:rawhide)	2m 37s
OS (alpine-docker.io/alpine)	28s
OS (alpine-docker.io/i386/alpine)	28s
OS ([email protected]/alpine)	31s
OS (nix-docker.io/nixos/nix)	1m 12s
OS (gentoo-)	5m 1s
OS (alpine@gudev-alpine, EXTRA_PACKAGES=libgudev-dev)	30s
	23m 56s

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