[Bug 214617] mail/p5-Mail-Alias: library no longer works on perl5.24

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214617

            Bug ID: 214617
           Summary: mail/p5-Mail-Alias: library no longer works on
                    perl5.24
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: perl at FreeBSD.org
          Reporter: takeda at takeda.tk
             Flags: maintainer-feedback?(perl at FreeBSD.org)
          Assignee: perl at FreeBSD.org

With perl5.20 the perl was issuing a warning but continued to work, after
upgrade to 5.24 the warning changed into an error that looks like this:

Can't use 'defined(@array)' (Maybe you should just omit the defined()?) at
/usr/local/lib/perl5/site_perl/Mail/Alias.pm line 85.
Compilation failed in require at ./bogofilter-milter.pl line 335.
BEGIN failed--compilation aborted at ./bogofilter-milter.pl line 335.

I'm not too familiar with perl but changing:

 croak "Unknown format '$fmt'"
  unless defined @{$pkg . "::ISA"};

into:

 croak "Unknown format '$fmt'"
  unless defined $pkg . "::ISA";

Seems to solve the issue for me.

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