qmake: Fix wince dll deployment in Visual Studio

This fix repairs the mechanism to deploy Qt dlls as well as C++ runtime
to a wince target in Visual Studio.

Do this by adding a deploy section in the Visual Studio solution and
adding the C++ runtime from the mkspec to the files deployed to the target.
Deploy target path is set to what the wizard of Visual Studio defaults to.
Before, the c++ runtime was only deployed for executables which were built
as part of Qt.

Task-number: QTBUG-50924
Change-Id: I478010dc16e35c68578281895aa3ae14b5c96bb4
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@theqtcompany.com>