Added twig extension.
 - Added support for twig
 - Added support for xcache
 - Changed PHP build to build as many extensions as possible as shared
   libraries.
 - Reorganized extension list
Removed PECL library for zip.  Using built-in support, but as a shared library.
Fixed bug where hiredis library was not included with extension.
Fixed pdo_sqlite.  https://bugs.php.net/bug.php?id=48614
Fixed issue with snmp module.  Should have been bundling the mibs with it.
Fixing libsqlite3-dev compilation error