Make cross compilation builds again

1292b304

 fixed existing b2qt ci compilation issues.
Enable cross compilation builds in ci.

Change-Id: I2092451c16a5cbdfff0dd57e627ddbded0001f79
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>