1. VxWorks 6.* and older are not supported in Qt6 due to C++17
requirement (among multiple other issues).
2. `_WRS_VXWORKS_MAJOR` and `_WRS_VXWORKS_MINOR` are defined in header
`version.h` on VxWorks 7, which is not included anywhere, causing
`QThread::idealThreadCount()` to always return 1. As a consequence,
instance of `QThreadPool` returned by `QThreadPool::globalInstance()`
have always only 1 thread. This causes failure of
`tst_QEventDispatcher::postEventFromThread` test case.
To fix that, remove VxWorks version checking from qthread_unix.cpp.
Pick-to: 6.7
Task-number: QTBUG-115777
Change-Id: I08ffc4acdb74d13dd822402407a71f5916603440
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 8fec93e9a7bf3f8cb80aafb1e2329d998552fbcc)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
3c494d4e40