devel/phpunit: Update from 5.4.4 to 5.4.6

5.4.6 - 2016-06-16

• PHAR does not contain all dependencies

5.4.5 - 2016-06-15

• Use setlocale() with 0 as second argument to not affect current setting
• Correctly handle paths to PHP binary that contain spaces (C:\Program Files) on Microsoft Windows

While here: add USES= php

Approved by: pi (mentor)