build with bundled PCRE instead of system PCRE

This has been done with the other versions of PHP:

php53u - https://bugs.launchpad.net/ius/+bug/608119
php54 - https://bugs.launchpad.net/ius/+bug/1039187
php55u - https://bugs.launchpad.net/ius/+bug/1215089
fix macros on php-odbc
fix macros in php-mysqlnd
Merge pull request #1 from mmckinst/master

build against bundled PCRE and fix some macors