Fixed session module is sending multiple set-cookie headers when session.use_strict_mode=1
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  Fixed session module is sending multiple set-cookie headers when session.use_strict_mode=1
Merge branch 'PHP-5.6'

* PHP-5.6:
  Fixed session module is sending multiple set-cookie headers when session.use_strict_mode=1