Fix setup for for multi profile build generators
Summary: Fix concern raised in https://phabricator.kde.org/R261:d1ef13e4ab9e71df7b723b7c57ed4b3c736d89fd
Test Plan: Compiled with DebugFull and Release
Reviewers: christiand
Reviewed By: christiand
Differential Revision: https://phabricator.kde.org/D12844