install: Fix bug with Start-Process -Wait, exclusive to PowerShell Core on Windows 7 (#3415)
install: Fix bug with Start-Process -Wait, exclusive to PowerShell Core on Windows 7 (#3415)

Close: https://github.com/lukesampson/scoop/issues/2580
See: https://github.com/PowerShell/PowerShell/issues/6561
nikolasd/scoop,kodybrown/scoop,lukesampson/scoop,berwyn/scoop,coonce/scoop,rasa/scoop