Fix build on Windows with new qdatetime.h that doesn't redefine min/max

Fix build on Windows with new qdatetime.h that doesn't redefine min/max

Windows system header files redefine min/max, unless NOMINMAX is defined.
In some cases we can simply include qt_windows.h, which does the trick,
in other cases including qt_windows.h produces different compilation
errors and it's simpler to just do the NOMINMAX trick.

Change-Id: I3cf81bab7c239363adfa274f158bdf999d1d3ecd
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>