projects using a dynamic build are not supposed to access this variable
anyway.

Task-number: QTBUG-51598
Change-Id: I81b55ea9ba460b80919f40ed7fe3d52129636b9e
Reviewed-by: Michal Klocek <michal.klocek@qt.io>
Reviewed-by: Jonathan Liu <net147@gmail.com>
(cherry picked from commit 05b3295a

)
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>