Log Message:
Update php56 to 5.6.31.

06 Jul 2017, PHP 5.6.31

- Core:
  . Fixed bug #73807 (Performance problem with processing post request over
    2000000 chars). (Nikita)
  . Fixed bug #74111 (Heap buffer overread (READ: 1) finish_nested_data from
    unserialize). (Nikita)
  . Fixed bug #74603 (PHP INI Parsing Stack Buffer Overflow Vulnerability).
    (Stas)
  . Fixed bug #74819 (wddx_deserialize() heap out-of-bound read via
    php_parse_date()). (Derick)

- GD:
  . Fixed bug #74435 (Buffer over-read into uninitialized memory). (cmb)

- mbstring:
  . Add oniguruma upstream fix (CVE-2017-9224, CVE-2017-9226, CVE-2017-9227,
    CVE-2017-9228, CVE-2017-9229) (Remi, Mamoru TASAKA)

- OpenSSL:
  . Fixed bug #74651 (negative-size-param (-1) in memcpy in zif_openssl_seal()).
    (Stas)

- PCRE:
  . Fixed bug #74087 (Segmentation fault in PHP7.1.1(compiled using the bundled \ 
PCRE library)).
    (Stas)

- WDDX:
   . Fixed bug #74145 (wddx parsing empty boolean tag leads to SIGSEGV). (Stas)