MFH: r413091 r414510 r414512

Add configtest support for php-fpm rc script.

PR: 208324
Sponsored by: A-Team Systems

lang/php56: update 5.6.20 -> 5.6.21

Changelog: http://www.php.net/ChangeLog-5.php#5.6.21

PR: 209145
Reported by Christian Schwarz <me@cschwarz.com>
Security: CVE-2016-3074
Security: https://vuxml.FreeBSD.org/freebsd/5764c634-10d2-11e6-94fa-002590263bf5.html

lang/php56: Restore ?= which was removed in r413091

PR: 208324 (introduced regression)
Approved by: portmgr (blanket)

Approved by: ports-secteam (with hat)