Add the proper include explicitly for <limits.h>
Add the proper include explicitly for <limits.h>

Task-number: QTPLAYGROUND-14

Change-Id: I56833fac1673b07b722b29de45e9625e868dca6c
Reviewed-by: Denis Shienkov <6a9c747bd2ba446682324cf340d3b86f30cf4d55@gmail.com>

RoadWorksSoftware/QtSerialPort-OS2,kobolabs/qtserialport,RoadWorksSoftware/QtSerialPort-OS2,kobolabs/qtserialport