Fixing PortableAppWithRuntimeTargetsIsPublishedCorrectly now that libuv is contained in the Shared Framework.

TestAssets/TestProjects/PortableTests/PortableAppWithNative/project.json

@@ -9,7 +9,8 @@
           "type": "platform",
           "version": "1.0.0-rc3-004391"
         },
-        "Microsoft.AspNetCore.Server.Kestrel": "1.0.0-*"
+        "Microsoft.AspNetCore.Server.Kestrel": "1.0.0-*",
+        "Libuv": "1.9.0-rc2-20896"
       },
       "imports": "dnxcore50"
     }

test/dotnet-publish.Tests/PublishPortableTests.cs

@@ -36,6 +36,8 @@ namespace Microsoft.DotNet.Tools.Publish.Tests
             // Prior to `type:platform` trimming, this would have been published.
             publishDir.Should().NotHaveFile("System.Linq.dll");
 
+            // PortableAppWithNative references a Libuv version that is explicitly
+            // not what is in Microsoft.NETCore.App.
             var runtimesOutput = publishDir.Sub("runtimes");
 
             runtimesOutput.Should().Exist();