Arcade release/7.0 PR failures

[MilenaHristova]

• [ ] This issue is blocking
• [ ] This issue is causing unreasonable pain

A few recent PRs to Arcades release/7.0 branch are failing tests on Windows

• https://github.com/dotnet/arcade/pull/14507
• https://github.com/dotnet/arcade/pull/14504
• https://github.com/dotnet/arcade/pull/14509

Failure log from the first listed PR: https://helix.dot.net/api/2019-06-17/jobs/5f332db1-20da-4408-aacd-6d0268b23310/workitems/AspNetCoreTest/console

C:\h\w\AD090924\w\A2130988\e>powershell C:\h\w\AD090924\w\A2130988\u\aspnet-versioncheck.ps1 -aspNetCoreVersion 7.0.0 
.NET SDK '8.0.200' -- major version: '8.0'; preview: ''
ASP.NET SDK '7.0.0' -- major version: '7.0'; preview: ''
ASP.NET Core Runtime version and .NET Core Runtime version do not match -- update DotNetCli.props!

C:\h\w\AD090924\w\A2130988\e>set _commandExitCode=1 

I'm not sure this is the main cause. In the individual test logs there is

+ dotnet exec --roll-forward Major --runtimeconfig Microsoft.DotNet.Build.Tasks.Feed.Tests.runtimeconfig.json --depsfile Microsoft.DotNet.Build.Tasks.Feed.Tests.deps.json /mnt/work/AB1F0951/p/xunit-runner/tools/netcoreapp2.0/xunit.console.dll Microsoft.DotNet.Build.Tasks.Feed.Tests.dll -nocolor -xml testResults.xml
dotnet: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by dotnet)
dotnet: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by dotnet)
+ export _commandExitCode=1