Merge pull request #679 from dotnet/addCleanTarget

Add empty Clean target

Author: AArnott

src/Nerdbank.GitVersioning.Tasks/build/PrivateP2PCaching.proj

@@ -10,4 +10,6 @@
   <Target Name="GetCopyToPublishDirectoryItems" />
   <Target Name="GetTargetFrameworksWithPlatformForSingleTargetFramework" />
 
-</Project>
+  <!-- This target is called by Clean or Rebuild on a referencing project. -->
+  <Target Name="Clean" />
+</Project>