Log Message:
Switch archivers/php-zip to using pkgsrc libzip

The module has bundled version 1.1.2, but the configure script warns
when using the bundled one, and it's of course better to not duplicate
it. Noticed this on recent PHP 7.1.14/7.2.2 releases which had fixes
for zip extension when used with libzip >= 1.3.1.

XXX May need backport of the fix for 7.0 and 5.6 which did not get the fix,
or can just switch over to using the PECL module directly