Remove LD_PRELOAD wrappers, properly guard the rest #212

Job	Run time
build (meson, ubuntu:22.04, true)	1m 21s
build (meson, ubuntu:24.04, true)	1m 37s
build (meson, archlinux:base-devel, true)	1m 32s
build (meson, fedora:latest)	1m 33s
build (meson, alpine:latest, -D docs=false)	54s
build (meson, debian:unstable, true)	1m 43s
build (autotools, ubuntu:22.04, true)	1m 43s
build (autotools, ubuntu:24.04, true)	2m 13s
build (autotools, archlinux:base-devel, true)	2m 5s
build (autotools, fedora:latest)	2m 4s
build (autotools, alpine:latest, -D docs=false)	1m 33s
build (autotools, debian:unstable, true)	2m 22s
	20m 40s

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