ignore examples in build traversal

Author: mgravell

Build.csproj

@@ -1,8 +1,8 @@
 <Project Sdk="Microsoft.Build.Traversal/2.0.19">
   <ItemGroup>
-    <ProjectReference Include="src\**\*.csproj" />
+    <ProjectReference Include="src\**\*.csproj" Exclude="examples\**\*.csproj" />
   </ItemGroup>
   <ItemGroup Condition="$(Packing) != 'true'">
-    <ProjectReference Include="**\*.csproj" />
+    <ProjectReference Include="**\*.csproj" Exclude="examples\**\*.csproj" />
   </ItemGroup>
 </Project>