Snippets for mapnik 4.2.2 from FreeBSD 150amd64

Sourced from https://pkg-status.freebsd.org/beefy23/data/latest-per-pkg/mapnik/4.2.2_2/150amd64-default.log.

• /wrkdirs/usr/ports/graphics/mapnik/work/.build/test/cleanup.hpp:30:5: warning: 'xmlCleanupEncodingAliases' is deprecated [-Wdeprecated-declarations]
     30 |     xmlCleanupEncodingAliases();
        |     ^
  

• /wrkdirs/usr/ports/graphics/mapnik/work/mapnik-4.2.2/test/visual/../cleanup.hpp:30:5: warning: 'xmlCleanupEncodingAliases' is deprecated [-Wdeprecated-declarations]
     30 |     xmlCleanupEncodingAliases();
        |     ^