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

This reverts commit 354df17d16.

scripts/buildkite-link-bun.ps1

@@ -0,0 +1,50 @@
+param(
+  [switch]$Baseline = $false
+)
+
+$ErrorActionPreference = 'Stop'  # Setting strict mode, similar to 'set -euo pipefail' in bash
+
+$Target = If ($Baseline) { "windows-x64-baseline" } Else { "windows-x64" }
+$Tag = "bun-$Target"
+
+. (Join-Path $PSScriptRoot "env.ps1")
+
+mkdir -Force build
+buildkite-agent artifact download "**" build --step "${Target}-build-zig"
+buildkite-agent artifact download "**" build --step "${Target}-build-cpp"
+buildkite-agent artifact download "**" build --step "${Target}-build-deps"
+mv -Force -ErrorAction SilentlyContinue build\build\bun-deps\* build\bun-deps
+mv -Force -ErrorAction SilentlyContinue build\build\* build
+
+Set-Location build
+
+# HACK: See scripts/build-bun-cpp.ps1
+Join-File -Path "$(Resolve-Path .)\bun-cpp-objects.a" -Verbose -DeletePartFiles
+
+cmake .. @CMAKE_FLAGS `
+  -G Ninja `
+  -DCMAKE_BUILD_TYPE=Release `
+  -DNO_CODEGEN=1 `
+  -DNO_CONFIGURE_DEPENDS=1 `
+  -DBUN_LINK_ONLY=1 `
+  "-DBUN_DEPS_OUT_DIR=$(Resolve-Path bun-deps)" `
+  "-DBUN_CPP_ARCHIVE=$(Resolve-Path bun-cpp-objects.a)" `
+  "-DBUN_ZIG_OBJ_DIR=$(Resolve-Path .)"
+if ($LASTEXITCODE -ne 0) { throw "CMake configuration failed" }
+
+ninja -v -j $env:CPUS
+if ($LASTEXITCODE -ne 0) { throw "Link failed!" }
+
+Set-Location ..
+$Dist = mkdir -Force "${Tag}"
+cp -r build\bun.exe "$Dist\bun.exe"
+Compress-Archive -Force "$Dist" "${Dist}.zip"
+$Dist = "$Dist-profile"
+MkDir -Force "$Dist"
+cp -r build\bun.exe "$Dist\bun.exe"
+cp -r build\bun.pdb "$Dist\bun.pdb"
+Compress-Archive -Force "$Dist" "$Dist.zip"
+
+$env:BUN_GARBAGE_COLLECTOR_LEVEL = "1"
+$env:BUN_FEATURE_FLAG_INTERNAL_FOR_TESTING = "1"
+.\build\bun.exe --print "JSON.stringify(require('bun:internal-for-testing').crash_handler.getFeatureData())" > .\features.json