Add property to set exclusivity

Disabling the serial port driver's exclusive mode is necessary for
pseudo serial ports and some USB/serial adapters to work correctly.

Change-Id: I74d45feed619817b61e265b00aec8b0ebfae7a33
Reviewed-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>
Windows: Fix waitAnyEvent() method

Wrong comparison between unsigned variable waitResult and signed size of vector.
The waitResult variable was interpreted as signed data type, that led to an
wrong result of comparison (e.g. when waitResult = WAIT_FAILED (0xFFFFFFFF)).

The solution - convert the size of the array to an unsigned data type and
leave waitResult without conversion.

Thanks to "boo kan, ong".

Task-number: QTBUG-32017
Change-Id: Iff25304d3d0345f47e3edc363a999a7b979cb1bb
Reviewed-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>
Reviewed-by: Laszlo Papp <lpapp@kde.org>
Merge branch 'release' into stable

Change-Id: I82f533fb54d2c32ab0831f709320d2044eccc70e
Merge remote-tracking branch 'origin/stable' into dev

Change-Id: I8911bb334d062892ef34cd555ce78badd5835969