Steps to reproduce:
1. Create a new project
2. Switch platform to UWP
3. In build settings set Visual Studio version to 2017
4. Build project with IL2CPP backend
5. Open solution in Visual Studios 2017
6. The warning is printed in the output window

Expected results: No warning is printed in the output window
Actual results: Warning is printed in the output window

Reproduced with: 2019.1.0a6, 2018.3.0b7, 2018.2.14f1, 2017.4.13f1, 2017.4.0f1

Warning: The build tools for Visual Studio 2015 (v140) cannot be found. Install Visual Studio 2015 (v140) to build using the Visual Studio 2015 (v140) build tools.

Tested with Visual Studios 2017 version 15.8.7