utils: Make build.ps1 work with PowerShell Core

Windows PowerShell (version 5) and PowerShell Core (versions 6+) do not
handle escaping parameters for external programs invocation in the same
manner. In order to keep the script compatible with both editions of
PowerShell, these changes use the appropriate quote escaping style
depending on the PowerShell edition.

This also clears out the progress bars that can ghost in following a
call to `Remove-Item` in PowerShell Core.

Author: Steelskin

utils/build.ps1

@@ -1678,8 +1678,10 @@ function Build-CMakeProject {
 
           $ArgWithForwardSlashes = $Arg.Replace("\", "/")
           if ($ArgWithForwardSlashes.Contains(" ")) {
-            # Quote and escape the quote so it makes it through
-            $Value += "\""$ArgWithForwardSlashes\"""
+            # Escape the quote so it makes it through. PowerShell 5 and Core
+            # handle quotes differently, so we need to check the version.
+            $quote = if ($PSEdition  -eq "Core") { '"' } else { '\"' }
+            $Value += "$quote$ArgWithForwardSlashes$quote"
           } else {
             $Value += $ArgWithForwardSlashes
           }
@@ -3693,6 +3695,9 @@ if (-not $SkipBuild) {
 
   Remove-Item -Force -Recurse ([IO.Path]::Combine((Get-InstallDir $HostPlatform), "Platforms")) -ErrorAction Ignore
 
+  # Clear the progress bar from the output or it keeps ghosting.
+  1..10 | ForEach-Object { Write-Progress -Id $_ -Activity "Removing previous Platforms directory" -Completed }
+
   Invoke-BuildStep Build-CMark $BuildPlatform
   Invoke-BuildStep Build-BuildTools $BuildPlatform
   if ($IsCrossCompiling) {