Revert "Convert build scripts to CMake (#13427)"

This reverts commit 354df17d16.

scripts/download-webkit.ps1

@@ -0,0 +1,42 @@
+param (
+  [Parameter(Mandatory)]
+  [string]$OutDir,
+  [Parameter(Mandatory)][string]$Tag,
+  [Parameter(Mandatory)][string]$PackageName
+)
+
+$ErrorActionPreference = "Stop"
+
+$Url = "https://github.com/oven-sh/WebKit/releases/download/autobuild-$Tag/$PackageName.tar.gz"
+$CacheDir = (mkdir -Force (Join-Path $PSScriptRoot "../.cache"))
+$TarPath = Join-Path $CacheDir "$PackageName-$Tag.tar.gz"
+
+if (Test-Path $OutDir\.tag) {
+  $CurrentTag = Get-Content -Path (Join-Path $OutDir ".tag")
+  if ($CurrentTag -eq $Tag) {
+    return
+  }
+}
+
+Remove-Item $OutDir -ErrorAction SilentlyContinue -Recurse
+$null = mkdir -Force $OutDir
+try {
+  Write-Host "-- Downloading WebKit"
+  if (!(Test-Path $TarPath)) {
+    try {
+      Invoke-WebRequest $Url -OutFile $TarPath -MaximumRetryCount 3 -RetryIntervalSec 1
+    } catch {
+      Write-Error "Failed to fetch WebKit from: $Url"
+      throw $_
+    }
+  }
+
+  Push-Location $CacheDir
+  tar.exe "-xzf" "$PackageName-$Tag.tar.gz" -C (Resolve-Path -Relative $OutDir\..\).replace('\', '/')
+  Pop-Location
+
+  Set-Content -Path (Join-Path $OutDir ".tag") -Value "$Tag"
+} catch {
+  Remove-Item -Force -ErrorAction SilentlyContinue $OutDir
+  throw $_
+}