depmod: Minor performance improvements #292

Job	Run time
build (meson, ubuntu:22.04, true)	1m 29s
build (meson, ubuntu:24.04, true)	1m 20s
build (meson, archlinux:base-devel, true)	1m 22s
build (meson, fedora:latest)	1m 29s
build (meson, alpine:latest, -D docs=false)	50s
build (meson, debian:unstable, true)	1m 39s
build (autotools, ubuntu:22.04, true)	1m 30s
build (autotools, ubuntu:24.04, true)	1m 50s
build (autotools, archlinux:base-devel, true)	1m 54s
build (autotools, fedora:latest)	2m 9s
build (autotools, alpine:latest, -D docs=false)	1m 29s
build (autotools, debian:unstable, true)	2m 12s
	19m 13s

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