Allow linking alternate memory management implementations (#454) #2108

Job	Run time
debian:12 (Latest Mapnik) (CMake) (GNU)	3m 59s
macos-12 (CMake) (LLVM)	11m 14s
ubuntu:24.04 (Latest Mapnik) (CMake) (GNU)	4m 14s
freebsd13 (CMake) (LLVM)	8m 44s
macos-13 (CMake) (LLVM)	13m 32s
debian:11 (CMake) (GNU)	3m 21s
freebsd14 (CMake) (LLVM)	7m 43s
macos-14 (CMake) (LLVM)	10m 13s
debian:12 (CMake) (GNU)	7m 27s
fedora:39 (CMake) (GNU)	4m 45s
fedora:40 (CMake) (GNU)	3m 58s
opensuse/leap:15 (CMake) (GNU)	5m 12s
quay.io/centos/centos:stream9 (CMake) (GNU)	5m 44s
ubuntu:22.04 (CMake) (GNU)	3m 19s
debian:unstable (CMake) (GNU)	3m 7s
fedora:rawhide (CMake) (GNU)	3m 29s
ubuntu:devel (CMake) (GNU)	3m 32s
ubuntu:24.04 (Autotools) (GNU)	2m 24s
ubuntu:24.04 (Autotools) (LLVM)	2m 42s
ubuntu:24.04 (CMake) (GNU)	3m 22s
ubuntu:24.04 (CMake) (LLVM)	3m 21s
	1h 55m 22s

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