Adjust dependency walking to allow for user overrides. (#2631)
Adjust dependency walking to allow for user overrides. (#2631)

Fixes #2615

Users can override the dependency walking rules by specifying the dll again like:

```xml
  <ItemGroup>
    <ReferenceCopyLocalPaths Include="Security.dll" />
  </ItemGroup>
```
pradipd/WinObjC,ehren/WinObjC,ehren/WinObjC,nathpete-msft/WinObjC,pradipd/WinObjC,nathpete-msft/WinObjC,pradipd/WinObjC,nathpete-msft/WinObjC,ehren/WinObjC,ehren/WinObjC,nathpete-msft/WinObjC,nathpete-msft/WinObjC,pradipd/WinObjC,pradipd/WinObjC,ehren/WinObjC