www/piwigo: update to 2.9.4www/piwigo: update to 2.9.4

Changelog:

• security fixes,
• bug fixes,
• compatibility with PHP 7.2 (also no longer compatible with PHP 5.2) and
• language updates

PR: 229843
Submitted by: Ralf van der Enden <tremere@cainites.net> (maintainer)
MFH: 2018Q3