Fix the runtime and the SDK paths for the swift build compiler case

This fix is necessary for the native win arm64 build where arm64 isn't
the first in the WindowsSDKs list.

Author: hjyamauchi

utils/build.ps1

@@ -1201,7 +1201,7 @@ function Build-CMakeProject {
     }
 
     if ($UseBuiltCompilers.Contains("Swift")) {
-      $env:Path = "$($BuildArch.SDKInstallRoot)\usr\bin;$(Get-CMarkBinaryCache $Arch)\src;$($BuildArch.ToolchainInstallRoot)\usr\bin;${env:Path}"
+      $env:Path = "$($BuildArch.SDKInstallRoot)\usr\bin;$(Get-CMarkBinaryCache $BuildArch)\src;$($BuildArch.ToolchainInstallRoot)\usr\bin;$(Get-PinnedToolchainRuntime);${env:Path}"
     } elseif ($UsePinnedCompilers.Contains("Swift")) {
       $env:Path = "$(Get-PinnedToolchainRuntime);${env:Path}"
     }
@@ -1969,7 +1969,7 @@ function Build-FoundationMacros() {
 
   $SwiftSDK = $null
   if ($Build) {
-    $SwiftSDK = $BuildArch.SDKInstallRoot
+    $SwiftSDK = $(Get-PinnedToolchainSDK)
   }
 
   $InstallDir = $null
@@ -2605,7 +2605,7 @@ function Build-TestingMacros() {
 
   $SwiftSDK = $null
   if ($Build) {
-    $SwiftSDK = $BuildArch.SDKInstallRoot
+    $SwiftSDK = $(Get-PinnedToolchainSDK)
   }
 
   $Targets = if ($Build) {