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
Approved by: portmgr (maintainer timeout, 2+ weeks)