Fixing a build break on windows.

src/Microsoft.DotNet.Compiler.Common/project.json

@@ -30,6 +30,9 @@
         },
         "System.Threading.Tasks": {
           "type": "build"
+        },
+        "System.Text.Encoding": {
+          "type": "build"
         }
       }
     },

src/Microsoft.DotNet.ProjectJsonMigration/ProjectDependencyFinder.cs

@@ -60,7 +60,6 @@ namespace Microsoft.DotNet.ProjectJsonMigration
 
                 if (!possibleProjectDependencies.TryGetValue(projectExportName, out projectDependency))
                 {
-                    Console.WriteLine($"Don't have it: {projectExportName} {projectExport.Library.Identity.Type}");
                     if (projectExport.Library.Identity.Type.Equals(LibraryType.Project) 
                         && !preResolvedProjects.Contains(projectExportName))
                     {

src/Microsoft.DotNet.ProjectModel/Resolution/UnresolvedDependencyProvider.cs

@@ -15,7 +15,7 @@ namespace Microsoft.DotNet.ProjectModel.Resolution
                 new LibraryIdentity(
                     libraryDependency.Name,
                     libraryDependency.LibraryRange.VersionRange?.MinVersion,
-                    libraryDependency.LibraryRange.TypeConstraint == LibraryDependencyTarget.Project ? LibraryType.Project : LibraryType.Unresolved),
+                    GetLibraryTypeFromLibraryDependencyTarget(libraryDependency.LibraryRange.TypeConstraint)),
                 hash: null,
                 path: null,
                 dependencies: Enumerable.Empty<ProjectLibraryDependency>(),