Added CheckIgnoredDeclsPass.CheckDecayedTypes option.

This is used for Embeddinator-4000 and could be removed once we improve our support for custom types.

src/Generator/Passes/CheckIgnoredDecls.cs

@@ -7,6 +7,8 @@ namespace CppSharp.Passes
 {
     public class CheckIgnoredDeclsPass : TranslationUnitPass
     {
+        public bool CheckDecayedTypes { get; set; } = true;
+
         public bool CheckDeclarationAccess(Declaration decl)
         {
             var generateNonPublicDecls = Options.IsCSharpGenerator;
@@ -135,6 +137,8 @@ namespace CppSharp.Passes
                     return false;
                 }
 
+                if (CheckDecayedTypes)
+                {
                     var decayedType = param.Type.Desugar() as DecayedType;
                     if (decayedType != null)
                     {
@@ -143,6 +147,7 @@ namespace CppSharp.Passes
                             function.Name);
                         return false;
                     }
+                }
 
                 if (param.Kind == ParameterKind.IndirectReturnType)
                 {