qmake vcproj generator: Don't generate WinMD by default on WinRT

Visual Studio will default to generating metadata, even if it is not
written to the vcproj. Since there is no metadata file, the build will
fail. This change keeps a saner default for this option when generating
WinRT project files.

Task-number: QTBUG-35328

Change-Id: Ie693e270ef0b9d9677d53af0c60905f048235bc5
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>

qmake/generators/win32/msvc_vcproj.cpp

@@ -978,6 +978,7 @@ void VcprojGenerator::initConfiguration()
             // Saner defaults
             conf.compiler.UsePrecompiledHeader = pchNone;
             conf.compiler.CompileAsWinRT = _False;
+            conf.linker.GenerateWindowsMetadata = _False;
         }
     }