Modernize usage of autoconf macros (#110) #151

Job	Run time
build (debian:trixie)	50s
build (debian:bookworm)	42s
build (debian:bullseye)	42s
build (debian:buster)	38s
build (ubuntu:jammy)	1m 54s
build (ubuntu:focal)	48s
build (ubuntu:bionic)	1m 24s
build (fedora/fedora:40)	46s
build (fedora/fedora:39)	1m 9s
build (fedora/fedora:38)	1m 6s
build (centos/centos:stream9)	48s
build (centos/centos:stream8)	52s
build (centos/centos:7)	1m 8s
build (rockylinux/rockylinux:9)	49s
build (rockylinux/rockylinux:8)	53s
build (alpine:edge)	27s
build (alpine:3.19)	30s
	15m 26s

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