qmake: remove pointless ~VCFilter()

It's empty, but non-trivial, thus preventing move special member
functions from being generated by the compiler (now that qmake
is compiled as C++11, too).

Change-Id: I9431311d24da802f147ce10e475936838bb85d41
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

qmake/generators/win32/msvc_objectmodel.h

@@ -936,7 +936,6 @@ class VCFilter
 public:
     // Functions
     VCFilter();
-    ~VCFilter(){}
 
     void addFile(const QString& filename);
     void addFile(const VCFilterFile& fileInfo);