Log Message:
Update php55 to 5.5.31, security fix.

07 Jan 2015, PHP 5.5.31

- FPM:
  . Fixed bug #70755 (fpm_log.c memory leak and buffer overflow). (Stas)

- GD:
  . Fixed bug #70976 (Memory Read via gdImageRotateInterpolated Array Index
    Out of Bounds). (emmanuel dot law at gmail dot com).

- WDDX:
  . Fixed bug #70661 (Use After Free Vulnerability in WDDX Packet Deserialization).
    (taoguangchen at icloud dot com)
  . Fixed bug #70741 (Session WDDX Packet Deserialization Type Confusion
    Vulnerability). (taoguangchen at icloud dot com)

- XMLRPC:
  . Fixed bug #70728 (Type Confusion Vulnerability in PHP_to_XMLRPC_worker()).
    (Julien)