Removed zend_execute_data->prev_nested_call. Reuse prev_execute_data instead.
use $PHP_LIBDIR instread of "lib" in skel example
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  use $PHP_LIBDIR instread of "lib" in skel example
Merge branch 'PHP-5.6'

* PHP-5.6:
  use $PHP_LIBDIR instread of "lib" in skel example