Update the perl-linter's l:pattern to catch missing errors

In some situations, errors reported by `perl -c` can have multiple
listings of "at <file> line <number>". If the l:pattern is changed to
use non-greedy matching it will also match these.

For example:
```
use strict;
use DateTime;
$asdf=1;
```

Results in:
```
Global symbol "$asdf" requires explicit package name (did you forget to declare "my $asdf"?) at /Users/mgrimes/t.pl line 3, <DATA> line 1.
/Users/mgrimes/t.pl had compilation errors.
```

I am not 100% sure why `perl -c` generates errors with the extra "file
line <num>". It only happens in some versions of perl when certain
modules are used.

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