Use the same outside logic for mysubs and formats

Use the same outside logic for mysubs and formats

By using find_runcv_where both for formats and my subs nested in inner
clonable subs, we can simplify the code.

It happens to make this work ($x is visible):

use 5.01;
sub not_lexical8 {
  my sub foo;
  foo();
  sub not_lexical9 {
    my sub bar {
      my $x = 'khaki car keys for the khaki car';
      not_lexical8();
      sub foo { warn $x }
    }
    bar()
  }
}
not_lexical9();

This is definitely iffy code, but if making it work makes the imple-
mentation simpler, so why not?