Default DynamicCodeSupported to true for CoreCLR

Author: sbomer

src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets

@@ -55,6 +55,7 @@ Copyright (c) .NET Foundation. All rights reserved.
     <_ComObjectDescriptorSupport Condition="'$(_ComObjectDescriptorSupport)' == ''">false</_ComObjectDescriptorSupport>
     <_DesignerHostSupport Condition="'$(_DesignerHostSupport)' == ''">false</_DesignerHostSupport>
     <_DefaultValueAttributeSupport Condition="'$(_DefaultValueAttributeSupport)' == ''">false</_DefaultValueAttributeSupport>
+    <DynamicCodeSupport Conditiont="'$(DynamicCodeSupport)' == ''">true</DynamicCodeSupport>
   </PropertyGroup>