[perl #124280] don't warn for 'my $foo, *bar'

[perl #124280] don't warn for 'my $foo, *bar'

It doesn't make sense to warn 'Parentheses missing around "my" list' if
adding the parens causes a syntax error (you can't declare typeglobs).

But it does make sense to warn for 'local $foo, *bar' because typeglobs
can be localized.

Thus modify the heuristic to only warn for '*' if we're not lexically
declaring something.