KCONFIG_ADD_KCFG_FILES: regenerate also on new version of kconfig_compiler
Test Plan: "touch"ing kconfig_compiler results in regeneration now.
Reviewers: Frameworks, vkrause
Reviewed By: vkrause
Subscribers: kde-frameworks-devel
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D26723