Fix the broken Windows namespace build
Fix the broken Windows namespace build

The namespace should begin *after* the Qt includes not to cause issues in those.

Change-Id: If725818e7e82591205ff5c2eab1908fb4d850d9b
Reviewed-by: Simo Fält <b598cfbc9cb80e3067479e5abd365cdf44c9b327@digia.com>
Reviewed-by: Denis Shienkov <6a9c747bd2ba446682324cf340d3b86f30cf4d55@gmail.com>

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