modphp: update to 5.5.2

* LIC_FILES_CHKSUM needed to change because the copyright year changed
* Enabled mcrypt since upstream recommend this for acceptable
  performance (and we now have a libmcrypt recipe in meta-oe)
* Disabled the opcache; this is a new feature in 5.5 and the configure
  check for it currently breaks when cross-compiling.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>