Make capturing explicit when using the PHP lambda form

[thekid]

The following code previously yielded the first command line argument due to the implicit capturing of local variables. This made it incompatible with PHP.

class Test {

  public static function main($args) {
    $f= function() { return $args[0]; };
    \util\cmd\Console::writeLine($f());
  }
}

We now need to add a use($args) in order for this to work.

This PR doesn't affect XP language where implicit binding is the default.