Fix CheckIncludedAssemblies() on .NET.

Author: jonpryor

src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/PackagingTest.cs

@@ -88,9 +88,21 @@ public void CheckIncludedAssemblies ([Values (false, true)] bool usesAssemblySto
 					"Java.Interop.dll",
 					"Mono.Android.dll",
 					"rc.bin",
+					"System.Collections.dll",
+					"System.Collections.Concurrent.dll",
+					"System.Collections.NonGeneric.dll",
+					"System.Console.dll",
+					"System.IO.Compression.dll",
+					"System.Net.Http.dll",
+					"System.Net.Primitives.dll",
+					"System.Net.Requests.dll",
 					"System.Private.CoreLib.dll",
 					"System.Runtime.dll",
 					"System.Linq.dll",
+					"System.Private.Uri.dll",
+					"System.Private.Xml.dll",
+					"System.Security.Cryptography.dll",
+					"System.Text.RegularExpressions.dll",
 					"UnnamedProject.dll",
 				} :
 				new [] {