Fix build Qt5 on MacOSX
Fix build Qt5 on MacOSX

Has been added missing .qmake.conf file to root directory.

Task-number: QTPLAYGROUND-9
Change-Id: Ia904dcbcb0b4aabab72dfcfc1a2fd671f0a421b2
Reviewed-by: Sergey Belyashov <8871b4c2d635fca691211507eadbac3d0bc2695a@gmail.com>
Reviewed-by: Denis Shienkov <6a9c747bd2ba446682324cf340d3b86f30cf4d55@gmail.com>

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