Fix Request #67453 Allow to unserialize empty data.

SplDoublyLinkedList, SplObjectStorage and ArrayObject have empty
constructor (no arg), so it make sense to allow to unserialize empty
data.

This allow the hack (used in various place, including PHPUnit) to
instanciate class without call to constructor to work.
NEWS
Merge branch 'PHP-5.6'

* PHP-5.6:
  NEWS
  Fix Request #67453 Allow to unserialize empty data.
Update copyright year to 2014
Update copyright year to 2014
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  Update copyright year to 2014
  Update copyright year to 2014
Update copyright year to 2014

Align with online version at http://www.php.net/license/3_01.txt
Update copyright year to 2014
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  Update copyright year to 2014
  Update copyright year to 2014
  Update copyright year to 2014
  Update copyright year to 2014
Update copyright year to 2014

Align with online version at http://www.php.net/license/3_01.txt
Update copyright year to 2014
Merge branch 'PHP-5.6'

* PHP-5.6:
  Update copyright year to 2014
  Update copyright year to 2014
  Update copyright year to 2014
  Update copyright year to 2014
  Update copyright year to 2014
  Update copyright year to 2014
Update copyright year to 2014
Suppress test failure with MySQL 5.7
Merge branch 'PHP-5.5' into PHP-5.6
Merge branch 'PHP-5.6'
new test, missing in ea466a3
Merge branch 'PHP-5.6'

* PHP-5.6:
  new test, missing in ea466a3
Fix another problem with MySQL 5.7
Merge branch 'PHP-5.6'