Snippets for mapnik 4.3.0 from Nix aarch64-darwin

Sourced from https://hydra.nixos.org/log/b8nphc4qv0x79sqvr52bc09qv5ydm6hn-mapnik-4.3.0.drv.

• /nix/var/nix/builds/nix-45734-3827608735/source/build/test/cleanup.hpp:30:5: warning: 'xmlCleanupEncodingAliases' is deprecated [-Wdeprecated-declarations]
     30 |     xmlCleanupEncodingAliases();
        |     ^
  

• /nix/var/nix/builds/nix-45734-3827608735/source/test/visual/../cleanup.hpp:30:5: warning: 'xmlCleanupEncodingAliases' is deprecated [-Wdeprecated-declarations]
     30 |     xmlCleanupEncodingAliases();
        |     ^