Log Message:
sysutils/fastfetch: further revision

* Media player and sound device discovery are only supported on Linux,
  so partially revert last commit by making dbus and pulseaudio options
  suggested just on Linux.
* Use system yyjson (since it's now avalable on pkgsrc) instead of
  building an embedded implementation.
* Fix GPU identification by pointing to correct PCI IDs database path.
* Bump revision.