Recent changes to /usr/ports/Mk breaks /usr/ports/ports-mgmt/p5-FreeBSD-Portindex

[Naram Qashat]

> The changes to port Mk files breaks
> /usr/ports/ports-mgmt/p5-FreeBSD-Portindex:
>
> When doing cache-init I get this:
>
> Processing make describe output for path "/usr/ports": Can't locate object
> method "mark_used_by" via package "FreeBSD::Portindex::Category" at
> /usr/local/lib/perl5/site_perl/FreeBSD/Portindex/Tree.pm line 431.
>
> portindex worked fine till the changes

I've actually already sent the information about this to Matthew, he said
he will look into it as soon as he can.