Add new MacPclExport for Xamarin.Mac

Author: mythz

src/ServiceStack.Text/PclExport.Net40.cs

@@ -23,9 +23,11 @@
 #if !__IOS__
 using System.Reflection.Emit;
 using FastMember = ServiceStack.Text.FastMember;
-#elif __UNIFIED__
+#endif
+
+#if __UNIFIED__
 using Preserve = Foundation.PreserveAttribute;
-#else
+#elif __IOS__
 using Preserve = MonoTouch.Foundation.PreserveAttribute;
 #endif
 
@@ -125,6 +127,7 @@ public override void RegisterLicenseFromConfig()
         {
 #if ANDROID
 #elif __IOS__
+#elif __MAC__
 #else
             //Automatically register license key stored in <appSettings/>
             var licenceKeyText = System.Configuration.ConfigurationManager.AppSettings[AppSettingsKey];
@@ -670,7 +673,25 @@ private static DynamicMethod CreateDynamicSetMethod(MemberInfo memberInfo)
 #endif
     }
 
-#if __IOS__
+#if __MAC__
+	public class MacPclExport : IosPclExport 
+	{
+		public static new MacPclExport Provider = new MacPclExport();
+
+		public MacPclExport()
+		{
+			PlatformName = "MAC";
+			SupportsEmit = SupportsExpression = true;
+		}
+		
+		public new static void Configure()
+		{
+			Configure(Provider);
+		}
+	}
+#endif
+
+#if __IOS__ || __MAC__
     [Preserve(AllMembers = true)]
     internal class Poco
     {