Re-add #if !PCL around DeserializeDynamic

Author: mythz

src/ServiceStack.Text/PclExport.cs

@@ -396,11 +396,13 @@ public virtual ParseStringDelegate GetSpecializedCollectionParseMethod<TSerializ
         public virtual ParseStringDelegate GetJsReaderParseMethod<TSerializer>(Type type)
             where TSerializer : ITypeSerializer
         {
+#if !PCL
             if (type.AssignableFrom(typeof(System.Dynamic.IDynamicMetaObjectProvider)) ||
                 type.HasInterface(typeof(System.Dynamic.IDynamicMetaObjectProvider)))
             {
                 return DeserializeDynamic<TSerializer>.Parse;
             }
+#endif
             return null;
         }