remove extra obsoletions inclusion in csproj

Author: Annchous

src/libraries/System.Security.Cryptography.Algorithms/src/System.Security.Cryptography.Algorithms.csproj

@@ -16,7 +16,6 @@
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="System\Security\Cryptography\CryptoConfig.Common.cs" />
-    <Compile Include="$(CommonPath)System\Obsoletions.cs" Link="Common\System\Obsoletions.cs" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetsBrowser)' != 'true'">
     <Compile Include="Internal\Cryptography\AesImplementation.cs" />