Removed non-`METATILE` code as it no longer seems to work #2065

Job	Run time
freebsd14 (CMake) (LLVM)	9m 6s
debian:12 (Latest Mapnik) (CMake) (GNU)	4m 5s
debian:unstable (CMake) (GNU)	3m 19s
ubuntu:24.04 (Latest Mapnik) (CMake) (GNU)	4m 12s
fedora:rawhide (CMake) (GNU)	4m 24s
macos-14 (Autotools) (LLVM)	7m 30s
ubuntu:devel (CMake) (GNU)	3m 39s
macos-14 (CMake) (LLVM)	15m 18s
ubuntu:24.04 (Autotools) (GNU)	2m 26s
ubuntu:24.04 (Autotools) (LLVM)	2m 49s
ubuntu:24.04 (CMake) (GNU)	3m 37s
ubuntu:24.04 (CMake) (LLVM)	3m 28s
	1h 3m 53s

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