The test system tried to run emrun (No .bat). This failed with a
file-not-found error on windows.
Also there was a test for (WIN32) when deciding to use cmd /c.
This test has been updated to (CMAKE_HOST_WIN32)
Also the aforementioned cmd /c was not present in the test run
output. It has been added.
Fixes: QTBUG-121996
Change-Id: Ib3c053949865038ad43abd479402f5e8e3c015ac
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
Reviewed-by: Piotr Wierciński <piotr.wiercinski@qt.io>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>