no-thread: enable using QFutureHEADdev

Enable using QFuture for handling async tasks, which
is a use case which can work also for the no-thread
configuration.

Add implementation files and headers for the QFuture
dependencies to the no-thread build. These files build,
but as with no-thread QThread there is no guarantee that
they will do anything useful.

Stub out some more functions in QThread, and also add
stubs for no-op QSemaphore.

Enable the tst_qfuture test and skip tests which require
threads. tst_qfuture now runs with:

   Totals: 70 passed, 0 failed, 13 skipped, 0 blacklisted, 6373ms

Pick-to: 6.10
Change-Id: Icd82590915d6034ae7829ead3fb4ebaf1e9c2aad
Reviewed-by: Tim Blechmann <[email protected]>
Reviewed-by: Artem Dyomin <[email protected]>

0 files changed, 0 insertions, 0 deletions