fix compile errors in NuGet.CommandLine project that broke the builds locally (#5710)

Author: kartheekp-ms

src/NuGet.Clients/NuGet.CommandLine/Commands/ProjectFactory.cs

@@ -761,6 +761,7 @@ private PackageDependency CreateDependencyFromProject(dynamic project, Dictionar
 
                 projectFactory.InitializeProperties(builder);
 
+#pragma warning disable CS0612 // Type or member is obsolete
                 if (!projectFactory.ProcessJsonFile(builder, project.DirectoryPath, null))
                 {
                     projectFactory.ProcessNuspec(builder, null);
@@ -772,6 +773,7 @@ private PackageDependency CreateDependencyFromProject(dynamic project, Dictionar
                         string.Format(CultureInfo.CurrentCulture, NuGetResources.ProjectJsonPack_Deprecated, builder.Id),
                         NuGetLogCode.NU5126));
                 }
+#pragma warning restore CS0612 // Type or member is obsolete
 
                 VersionRange versionRange = null;
                 if (dependencies.ContainsKey(builder.Id))

src/NuGet.Clients/NuGet.CommandLine/Common/Solution.cs

@@ -135,7 +135,7 @@ private void LoadSolutionWithMsbuild14(Assembly msbuildAssembly, string solution
 
                 try
                 {
-                    var projectShouldBuild = !isSolutionFilter || projectShouldBuildMethod.Invoke(solutionFile, new object[] { project.RelativePath });
+                    var projectShouldBuild = !isSolutionFilter || (bool)projectShouldBuildMethod.Invoke(solutionFile, new object[] { project.RelativePath });
                     if (projectShouldBuild)
                     {
                         var relativePath = project.RelativePath.Replace('\\', Path.DirectorySeparatorChar);