Props to make Type Providers compile from dotnet build

Directory.build.props

<?xml version="1.0" encoding="utf-8"?>
<Project>
  <!-- Type providers currently can't run inside the .NET Core 2.0 hosted compiler, see https://github.com/Microsoft/visualfsharp/pull/3658#issuecomment-334773415 -->
  <PropertyGroup>
    <IsWindows Condition="'$(OS)' == 'Windows_NT'">true</IsWindows>
    <IsOSX Condition="'$([System.Runtime.InteropServices.RuntimeInformation]::IsOSPlatform($([System.Runtime.InteropServices.OSPlatform]::OSX)))' == 'true'">true</IsOSX>
    <IsLinux Condition="'$([System.Runtime.InteropServices.RuntimeInformation]::IsOSPlatform($([System.Runtime.InteropServices.OSPlatform]::Linux)))' == 'true'">true</IsLinux>
  </PropertyGroup>  
  <PropertyGroup Condition="'$(IsWindows)' == 'true' AND Exists('C:\Program Files (x86)\Microsoft SDKs\F#\4.1\Framework\v4.0\fsc.exe')">
    <FscToolPath>C:\Program Files (x86)\Microsoft SDKs\F#\4.1\Framework\v4.0</FscToolPath>
    <FscToolExe>fsc.exe</FscToolExe>
  </PropertyGroup>
  <PropertyGroup Condition="'$(IsWindows)' == 'true' AND Exists('C:\Program Files (x86)\Microsoft SDKs\F#\10.1\Framework\v4.0\fsc.exe')">
    <FscToolPath>C:\Program Files (x86)\Microsoft SDKs\F#\10.1\Framework\v4.0</FscToolPath>
    <FscToolExe>fsc.exe</FscToolExe>
  </PropertyGroup>
  <PropertyGroup Condition="'$(IsOSX)' == 'true'  AND Exists('/Library/Frameworks/Mono.framework/Versions/Current/Commands/fsharpc')">
    <FscToolPath>/Library/Frameworks/Mono.framework/Versions/Current/Commands</FscToolPath>
    <FscToolExe>fsharpc</FscToolExe>
  </PropertyGroup>
  <PropertyGroup Condition="'$(IsLinux)' == 'true' AND Exists('/usr/bin/fsharpc')">
    <FscToolPath>/usr/bin</FscToolPath>
    <FscToolExe>fsharpc</FscToolExe>
  </PropertyGroup>
</Project>

According to this issue