[tests] Fix ProtocolTest to work with in both monotouch-test and linkall. (#3598)

The [Protocol] attributes the test checks for are not linked away in
monotouch-test (because monotouch-test only links SDK assemblies), but they
are linked away in link all, so adjust the test accordingly.

tests/bindings-test/ProtocolTest.cs

@@ -19,6 +19,16 @@ namespace Xamarin.BindingTests
 	[Preserve (AllMembers = true)]
 	public class ProtocolTest
 	{
+		bool HasProtocolAttributes {
+			get {
+#if LINKALL
+				if (!Runtime.DynamicRegistrationSupported)
+					return false;
+#endif
+				return true;
+			}
+		}
+
 		[Test]
 		public void OnlyProtocol ()
 		{
@@ -30,7 +40,7 @@ namespace Xamarin.BindingTests
 			Assert.IsNotNull (IP1, "IP1");
 			// with a [Protocol] attribute
 			var IP1Attributes = IP1.GetCustomAttributes (typeof (ProtocolAttribute), false);
-			if (Runtime.DynamicRegistrationSupported) {
+			if (HasProtocolAttributes) {
 				Assert.AreEqual (1, IP1Attributes.Length, "[Protocol] IP1");
 				var IP1Protocol = (ProtocolAttribute)IP1Attributes [0];
 				Assert.AreEqual ("P1", IP1Protocol.Name, "Name");
@@ -62,7 +72,7 @@ namespace Xamarin.BindingTests
 
 			// with a [Protocol] attribute
 			var IP2Attributes = IP2.GetCustomAttributes (typeof (ProtocolAttribute), false);
-			if (Runtime.DynamicRegistrationSupported) {
+			if (HasProtocolAttributes) {
 				Assert.AreEqual (1, IP2Attributes.Length, "[Protocol] IP2");
 				var IP2Protocol = (ProtocolAttribute)IP2Attributes [0];
 				Assert.AreEqual ("P2", IP2Protocol.Name, "Name");
@@ -98,7 +108,7 @@ namespace Xamarin.BindingTests
 
 			// with a [Protocol] attribute
 			var IP3Attributes = IP3.GetCustomAttributes (typeof (ProtocolAttribute), false);
-			if (Runtime.DynamicRegistrationSupported) {
+			if (HasProtocolAttributes) {
 				Assert.AreEqual (1, IP3Attributes.Length, "[Protocol] IP3");
 				var IP3Protocol = (ProtocolAttribute)IP3Attributes [0];
 				Assert.AreEqual ("P3", IP3Protocol.Name, "Name");