Remove support for Apache HTTPD < 2.4 (#407) #551

Job	Run time
debian:12 (Latest Mapnik) (CMake) (GNU)	3m 25s
freebsd13 (CMake) (LLVM)	7m 43s
ubuntu:22.04 (Latest Mapnik) (CMake) (GNU)	3m 37s
freebsd14 (CMake) (LLVM)	7m 23s
debian:11 (CMake) (GNU)	3m 12s
debian:12 (CMake) (GNU)	3m 12s
debian:testing (CMake) (GNU)	3m 0s
macos-12 (CMake) (LLVM)	16m 1s
fedora:38 (CMake) (GNU)	4m 26s
macos-13 (Autotools) (LLVM)	14m 6s
fedora:39 (CMake) (GNU)	3m 40s
macos-13 (CMake) (LLVM)	18m 0s
fedora:rawhide (CMake) (GNU)	3m 40s
opensuse/leap:15 (CMake) (GNU)	7m 31s
quay.io/centos/centos:stream8 (CMake) (GNU)	5m 41s
quay.io/centos/centos:stream9 (CMake) (GNU)	6m 33s
ubuntu:20.04 (CMake) (GNU)	3m 3s
ubuntu:rolling (CMake) (GNU)	2m 50s
ubuntu:22.04 (Autotools) (GNU)	1m 54s
ubuntu:22.04 (Autotools) (LLVM)	2m 9s
ubuntu:22.04 (CMake) (GNU)	2m 58s
ubuntu:22.04 (CMake) (LLVM)	3m 12s
	2h 7m 16s

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