Remove no longer needed interface

Author: kant2002

src/coreclr/nativeaot/System.Private.CoreLib/src/System.Private.CoreLib.csproj

@@ -257,9 +257,6 @@
   <ItemGroup Condition="'$(TargetsWindows)'=='true'">
     <Compile Include="Microsoft\Win32\SafeHandles\SafeThreadPoolIOHandle.cs" />
     <Compile Include="System\Runtime\InteropServices\PInvokeMarshal.Windows.cs" />
-    <Compile Include="$(CommonPath)\System\Runtime\InteropServices\IDispatch.cs">
-      <Link>System\Runtime\InteropServices\IDispatch.cs</Link>
-    </Compile>
     <Compile Include="$(CommonPath)\System\Runtime\InteropServices\Variant.cs">
       <Link>System\Runtime\InteropServices\Variant.cs</Link>
     </Compile>