build against bundled PCRE and fix some macors

Building against the bundled PCRE instead of the system PCRE has been done in these previous bug reports:

php53u - https://bugs.launchpad.net/ius/+bug/608119
php54 - https://bugs.launchpad.net/ius/+bug/1039187
php55u - https://bugs.launchpad.net/ius/+bug/1215089