Don't build snupkg for meta-package

Author: AArnott

src/Win32/Win32.csproj

@@ -7,6 +7,7 @@
 
     <!-- This package is just a wrapper -->
     <IncludeBuildOutput>false</IncludeBuildOutput>
+    <IncludeSymbols>false</IncludeSymbols>
   </PropertyGroup>
   <ItemGroup>
     <ProjectReference Include="..\AdvApi32\AdvApi32.csproj" />
@@ -35,4 +36,4 @@
     <ProjectReference Include="..\Wtsapi32\Wtsapi32.csproj" />
     <ProjectReference Include="..\Magnification\Magnification.csproj" />
   </ItemGroup>
-</Project>
+</Project>