dns/libpsl: Update to 0.21.2 and switch to Meson
- Switch to Meson (simplifies patching and is faster)
- Drop IDN option, only allow IDNA2008 compatible libraries
- Switch default library to (lib)ICU as its a more common dependency
- Enable "make test"
- Install psl-make-dafsa binary not just manpage
- Modernize Makefile to follow Porters Handbook more closely
Changelog: https://github.com/rockdaboot/libpsl/releases/tag/0.21.2
PR: 268544
Approved by: portmgr (maintainer timeout, 2+ weeks)