[Trinity] Build PHP packages against Trinity stack's library versions

[pst]

PHP Warning:  PHP Startup: Unable to load dynamic library '/srv/www/php-5.6.15/lib/php/extensions/imagick.so' - libMagickWand.so.4: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/srv/www/php-5.6.15/lib/php/extensions/intl.so' - libicui18n.so.48: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/srv/www/php-5.6.15/lib/php/extensions/memcached.so' - libmemcached.so.11: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/srv/www/php-5.6.15/lib/php/extensions/imagick.so' - libMagickWand.so.4: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/srv/www/php-5.6.15/lib/php/extensions/intl.so' - libicui18n.so.48: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/srv/www/php-5.6.15/lib/php/extensions/memcached.so' - libmemcached.so.11: cannot open shared object file: No such file or directory in Unknown on line 0