Remove dead code

Summary:
Believe it or not, this is triggering some really bizarre linker errors
on clang/libc++ (noticed by the FreeBSD CI, but reproducable in this
configuration on Linux too).

Reviewers: aheinecke, winterz

Reviewed By: aheinecke, winterz

Subscribers: kde-pim

Tags: #kde_pim

Differential Revision: https://phabricator.kde.org/D13857