Patching inconsistent path separator in Batch file. This at some point
may lead to something similar to the mentioned task.
Task-number: QTBUG-109857
Change-Id: I36c05dc7a0b7daf3dc5dced61f3c3f7d90eb59e3
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
(cherry picked from commit 07a978c756cba6953bf81497fa3a386793652242)
Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>