Remove [Serializable] from OptionException (#73316)

We are no longer introducing [Serializable] exception types unless the library targets both .NET and downlevel. (Serialization of exceptions doesn't work in wasm anyway.) This removes the stray annotation.

Author: GrabYourPitchforks

src/mono/wasm/host/Options.cs

@@ -169,9 +169,6 @@
 using System.IO;
 #if PCL
 using System.Reflection;
-#else
-using System.Runtime.Serialization;
-using System.Security.Permissions;
 #endif
 using System.Text;
 using System.Text.RegularExpressions;
@@ -766,9 +763,6 @@ public override bool GetArguments(string value, out IEnumerable<string> replacem
     }
 #endif
 
-#if !PCL
-    [Serializable]
-#endif
     public class OptionException : Exception
     {
         private string option;
@@ -789,29 +783,10 @@ public OptionException(string message, string optionName, Exception innerExcepti
             this.option = optionName;
         }
 
-#if !PCL
-        protected OptionException(SerializationInfo info, StreamingContext context)
-            : base(info, context)
-        {
-            this.option = info.GetString("OptionName");
-        }
-#endif
-
         public string OptionName
         {
             get { return this.option; }
         }
-
-#if !PCL
-#pragma warning disable 618 // SecurityPermissionAttribute is obsolete
-        // [SecurityPermission(SecurityAction.LinkDemand, SerializationFormatter = true)]
-#pragma warning restore 618
-        public override void GetObjectData(SerializationInfo info, StreamingContext context)
-        {
-            base.GetObjectData(info, context);
-            info.AddValue("OptionName", option);
-        }
-#endif
     }
 
     public delegate void OptionAction<TKey, TValue>(TKey key, TValue value);