On Windows added missing install dll target
On Windows added missing install dll target

For Qt4 added a missed target installation library to the Qt /bin directory.

Change-Id: Idc3fe702ff2b2af229f37df62f24afa700c881e7
Reviewed-by: Laszlo Papp <2164cc32668ec579454611fc5261234262c80421@kde.org>
Reviewed-by: Denis Shienkov <1ad2dee90c89b865e4a01188e9919a005e3f77cf@yandex.ru>

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