php: security bump to version 5.2.16

* Fixed extract() to do not overwrite $GLOBALS and $this when using
  EXTR_OVERWRITE.

* Fixed crash in zip extract method (possible CWE-170).

* Fixed a possible double free in imap extension.

* Fixed possible flaw in open_basedir (CVE-2010-3436).

* Fixed NULL pointer dereference in ZipArchive::getArchiveComment.
  (CVE-2010-3709).

* Fixed bug #52929 (Segfault in filter_var with FILTER_VALIDATE_EMAIL
  with large amount of data).

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>