Prospective build fix for shadow builds with MSVC

Don't rely on MSVC's slightly different semantics of #include with quotes,
simply include the header files from the other directory through the
syncqt generated wrappers that always work.

Change-Id: Idebb4121e4a14732494613e9b5bc383a8f52fb00
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>