Clean clone raises build warning

[Jaxsbr]

I ran into this build warning after a clean clone, same issue as #341
VS 2019 (16.11.9)

Severity	Code	Description	Project	File	Line	Suppression State
Warning		The file 'app.config' could not be added to the project.  Cannot add a link to the file C:\code-lab\FNA\app.config. This file is within the project directory tree.	FNA		

I was able to remedy this by modifying the FNA.csproj as below.
From: src

<None Include="app.config">
  <Link>$(TargetFileName).config</Link>
  <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>

To:

<None Include="app.config">
  <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>

[flibitijibibo]

This kind of reads like a 2019 regression... the destination path isn't even correct misread the message, seems like they're both source paths... still doesn't explain why it suddenly hates the link.

For reference, this block is required by earlier VS versions: 555d234