So we don't have to maintain the requirements in two places.
None of the variables removed from the qmake configs are
referenced before we do load(qt_config), so this should
be safe.
Change-Id: Iabd5884a2fd1c4b1cd7b44416bebb2624050229e
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
(cherry picked from commit 640a3f24741dbd50cc5aff425c81d09f908054b4)
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
51ef5b0d65