fix bug #65481 (shutdown segfault due to serialize)
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  fix bug #65481 (shutdown segfault due to serialize)

Conflicts:
	ext/standard/var_unserializer.c
Merge branch 'PHP-5.5'

* PHP-5.5:
  fix bug #65481 (shutdown segfault due to serialize)