Revert "build, qt5_use_modules is deprecated in Qt 5.11"

Authored by timotheegiet on Jul 21 2018, 4:21 PM.

Description

Revert "build, qt5_use_modules is deprecated in Qt 5.11"

This reverts commit 3527873105ab9d463092e1a86b496b7e81a968fd.

For now we still build packages using 5.9.*
and this change breaks the build.

So this needs to be made conditional, or just wait that we use the next Qt LTS version