To reproduce:
1. Open attached project "repro.zip"
2. Build for any platform e.g. iOS or WebGl
3. Observe the console

Expected result: the project is built without errors
Actual result: getting UnityLinker.exe did not run properly error, also it states that the build Succeeded even though builds folder is empty

Reproduced on: 2018.1.3f1 2018.2.0b8 2018.3.0a1

Notes:
On 2017.4.5f1 and earlier versions getting ArgumentException: The Assembly netstandard is referenced by System.Threading.Tasks.Extensions ('Assets/Plugins/System.Threading.Tasks.Extensions.dll'). But the dll is not allowed to be included or could not be found. errors which prevent from building the project

Works fine building to Standalone with Mono Scripting Backend