testsuite: Fix build with gcc < 15 #1100

Job	Run time
build (debian:unstable)	3m 21s
build (alpine:latest, -Db_sanitize=none, 64)	2m 4s
build (archlinux:multilib-devel)	2m 56s
build (debian:bullseye-slim, -Dzstd=disabled -Dxz=disabled -Dzlib=disabled, gcc)	1m 52s
build (archlinux:multilib-devel, -Dmoduledir=/usr/lib/modules, 64, gcc, usr-moduledir)	1m 38s
build (archlinux:multilib-devel, 64, clang, ldd-as-linker, lld)	1m 33s
build (ubuntu:22.04)	2m 42s
build (archlinux:multilib-devel, -Dmoduledir=/kernel-modules, 64, gcc, custom-moduledir)	1m 42s
build (fedora:latest, 64)	2m 37s
build (ubuntu:24.04)	3m 2s
build (ubuntu:22.04, -Ddlopen=zstd,zlib, 64, dlopen-zstd-zlib)	2m 17s
build (fedora:latest, -Dxz=disabled -Ddlopen=all, 64, no-xz-dlopen-all)	2m 31s
	28m 15s

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