build with PCRE bundled with PHP instead of with older system PCRE

Newer software often times wants a newer version of the PCRE library to be installed and won't work with an older version from 2008.

The version of the PCRE library that comes with CentOS/RHEL 6 is 7.8. The version of the PCRE library that comes with PHP 5.5 is 8.32 (http://www.php.net/manual/en/pcre.installation.php) .

This has been done with php53u and php54:

php53u - https://bugs.launchpad.net/ius/+bug/608119
php54  - https://bugs.launchpad.net/ius/+bug/1039187