title: additionalProbingPaths not respected after dotnet publish?
body: <p>I'm using dotnet 2.1.4 on Windows. dotnet --info shows:</p>
  
  <pre><code>.NET Command Line Tools (2.1.4)
  
  Product Information:
   Version:            2.1.4
   Commit SHA-1 hash:  5e8add2190
  
  Runtime Environment:
   OS Name:     Windows
   OS Version:  10.0.16299
   OS Platform: Windows
   RID:         win10-x64
   Base Path:   C:\Program Files\dotnet\sdk\2.1.4\
  
  Microsoft .NET Core Shared Framework Host
  
    Version  : 2.0.5
    Build    : 17373eb129b3b05aa18ece963f8795d65ef8ea54
  </code></pre>
  
  <p>I'm using dotnet publish to create the output for a platform:</p>
  
  <pre><code>dotnet publish ..\src\ChestnutDS.Host\ChestnutDS.Host.csproj
       -c Release -o ..\..\published\win-x64
       --self-contained -r win-x64 -v n
  </code></pre>
  
  <p>This gives me the desired (and working) output in a folder with 323 files.</p>
  
  <p><a href="https://i.stack.imgur.com/RvwEG.png" rel="noreferrer"><img src="https://i.stack.imgur.com/RvwEG.png" alt="published folder"></a></p>
  
  <p>Now, what I want to do is move all most of the files into a subfolder, e.g., lib.</p>
  
  <p><a href="https://i.stack.imgur.com/i6r1a.png" rel="noreferrer"><img src="https://i.stack.imgur.com/i6r1a.png" alt="Moved most of the stuff into lib"></a></p>
  
  <p>From what I've gathered, setting <code>additionalProbingPaths</code> in the runtimeconfig.json <a href="https://stackoverflow.com/questions/47839958/can-i-place-native-dependencies-in-a-subfolder/47867045#47867045"><strong>should</strong> work:</a></p>
  
  <pre><code>{
    "runtimeOptions": {
      "additionalProbingPaths": [
        "lib"
      ]
    }
  }
  </code></pre>
  
  <p>But it complains about not finding the libraries:</p>
  
  <pre><code>Error:
    An assembly specified in the application dependencies manifest (ChestnutDS.Host.deps.json) was not found:
      package: 'Microsoft.AspNetCore.Antiforgery', version: '2.0.1'
      path: 'lib/netstandard2.0/Microsoft.AspNetCore.Antiforgery.dll'
  </code></pre>
  
  <p>Trying to pass --additionalProbingPath as a command line argument also doesn't work, same error.</p>
  
  <p>Trying to create the mentioned structure and moving the file (<code>lib/netstandard2.0/Microsoft.AspNetCore.Antiforgery.dll</code>) also doesn't work.</p>
  
  <p>Am I missing something? Was that functionality removed? It doesn't seem like it, the <a href="https://github.com/dotnet/core-setup/blob/5a1a53181b51c00b34c9b2fb8be92d6f03b5e9ed/src/corehost/cli/runtime_config.cpp#L77" rel="noreferrer">source code still contains it</a>.</p>