Use the right outside for my subs defined in inner subs

Use the right outside for my subs defined in inner subs

In this example,

{
  my sub foo;
  sub bar {
    sub foo { }
  }
}

the foo sub is cloned when the scope containing the ‘my sub’ declara-
tion is entered, but foo’s CvOUTSIDE pointer points to something other
than the active sub.  cv_clone assumes that the currently-running sub
is the right sub to close over (at least for subs; formats are another
matter).  That was true in the absence of my subs.  This commit
changes it to account.

I had to tweak the test, which was wrong, because sub foo was closing
over a stale var.