Clean up Q_WS_WIN

The first branch is required to MSVC. The bitfield isn't large enough to
represent all possible enum values of Virtualness for MSVC.

In addition, using bitfield is a premature optimisation in this case.
So remove them.

Change-Id: I4c5f85271d2bca1411426e6a321a795a7e783aff
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

src/tools/qdoc/node.h

@@ -822,13 +822,8 @@ private:
 
     QString     rt;
     QStringList pp;
-#ifdef Q_WS_WIN
     Metaness    met;
     Virtualness vir;
-#else
-    Metaness met : 4;
-    Virtualness vir : 2;
-#endif
     bool con : 1;
     bool sta : 1;
     bool ove : 1;