devel/aphpunit: Upgrade from 1.7 to 1.8

Changelog:

• Bugfix: now exit with code 1, if no test-cases were found
• Bugfix: now exit with code 1, if not a single assertion was performed
• Bugfix: detected PHP errors are no longer unhandled. They are no reported as error

Changelog taken from: https://gitlab.toco-domains.de/tocOS/APHPUnit/blob/master/CHANGELOG

MFH: 2019Q2