bug#47345: perl-mode: Fix some regexps for fontification [PATCH]

[Lars Ingebrigtsen]

haj@posteo.de (Harald Jörg) writes:

> Following a discussion with Stefan Monnier on the developer list:
>
>  - In "use Package;" the package name is now captured for fontifying
>    as intended
>
>  - The declarators "my" etc. now use font-lock-keyword-face for better
>    consistency with other programming modes
>
>  - As a by-catch, now all components of package names like
>    "Long::Package::Name" are fontified.  This was a known issue of
>    little importance, not yet reported as a bug.
>
>  - A test is included as well.

Thanks; looks good to me.  Pushed now to Emacs 28.

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