Do it for all packages that
* mention perl, or
* have a directory name starting with p5-*, or
* depend on a package starting with p5-
like last time, for 5.18, where this didn't lead to complaints.
Let me know if you have any this time.
URIs that contain other URIs. The basic format is:
{prefix}:{uri}
Some examples:
* `jdbc:oracle:scott/tiger@//myhost:1521/myservicename`
* `db:postgres://db.example.com/template1`