Update php53 to 5.3.21.

* pkgsrc change: use locally recreated suhosin patch file.

17 Jan 2013, PHP 5.3.21

- Zend Engine:
  . Fixed bug #63762 (Sigsegv when Exception::$trace is changed by user).
    (Johannes)

- cURL extension:
  . Fixed bug (segfault due to libcurl connection caching). (Pierrick)
  . Fixed bug #63795 (CURL >= 7.28.0 no longer support value 1 for
    CURLOPT_SSL_VERIFYHOST). (Pierrick)
  . Fixed bug #63352 (Can't enable hostname validation when using curl stream
    wrappers). (Pierrick)
  . Fixed bug #55438 (Curlwapper is not sending http header randomly).
    (phpnet@lostreality.org, Pierrick)

(taca)