pfPorts: Update pecl-APC to 3.1.13 (FreeBSD ports r303839)

This newer pecl-APC should provide compatibility with at least up to
PHP 5.4, development versions are already targetting 5.5.

Our port did not contain local modifications. Now taken from FreeBSD
ports r303839, with following commit message:

Author: sunpoet <sunpoet@FreeBSD.org>
Date:   Fri Sep 7 23:24:40 2012 +0000

    - Update to 3.1.13

    Changes:    http://pecl.php.net/package-changelog.php?package=APC
    PR:         ports/171289
    Submitted by:       Matthew Horan <matt@matthoran.com>