Use KDE_INSTALL_KCONFUPDATEDIR instead of hard-coding CMAKE_INSTALL_PREFIX

Authored by heikobecker on Aug 24 2016, 6:33 PM.

Description

Use KDE_INSTALL_KCONFUPDATEDIR instead of hard-coding CMAKE_INSTALL_PREFIX

Subscribers: plasma-devel

Reviewers: Plasma

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D2562