Build.cmd fails when VisualStudio 2019 is installed

[nohwnd]

Description

Steps to reproduce

Install VisualStudio 2019, and VisualStudio 2017 with the workloads as defined in contributions guild. Run build.cmd.

Expected behavior

To honor the dependency on VisualStudio 2017 and pass the build correctly.

Actual behavior

Build fails with:

... Update-VsixVersion: Completed.
C:\Projects\vstest\scripts\build.ps1 : The term 'C:\Program Files (x86)\Microsoft Visual
Studio\2019\Community\MSBuild\15.0\Bin\msbuild.exe' is not recognized as the name of a cmdlet, function, script file, or operable program.  Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ C:\Projects\vstest\scripts\build.ps1 ; exit $LastExitCode;
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (C:\Program File...Bin\msbuild.exe:String) [build.ps1], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException,build.ps1

It fails because it finds VisualStudio 2019, which does not ship with msbuild 15.0 (but it has folder for it).

Diagnostic logs

Environment

Windows 10, latest code from master.