Fix the exporting define issue after the global header change
Fix the exporting define issue after the global header change

Change-Id: Ie100c9c3eef6fe559142ecd34b667d117466f82e
Reviewed-by: Denis Shienkov <6a9c747bd2ba446682324cf340d3b86f30cf4d55@gmail.com>

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