utils: write SDKSettings for experimental SDKs

Add support to emit the SDKSettings.json for the experimental SDK. This
ensures that the we have the settings available for the tools when using
this SDK.

Author: compnerd

utils/build.ps1

@@ -2396,7 +2396,7 @@ function Build-ExperimentalRuntime {
   }
 }
 
-function Write-SDKSettings([OS] $OS) {
+function Write-SDKSettings([OS] $OS, [string] $Identifier = $OS.ToString()) {
   $SDKSettings = @{
     CanonicalName = $OS.ToString().ToLowerInvariant()
     DisplayName = $OS.ToString()
@@ -2432,8 +2432,8 @@ function Write-SDKSettings([OS] $OS) {
       $SDKSettings.SupportedTargets.android.Archs = $AndroidSDKPlatforms | ForEach-Object { $_.Architecture.LLVMName } | Sort-Object
     }
   }
-  $SDKSettings | ConvertTo-JSON -Depth 4 | Out-FIle -FilePath "$(Get-SwiftSDK $OS)\SDKSettings.json"
-  Write-PList -Settings $SDKSettings -Path "$(Get-SwiftSDK $OS)\SDKSettings.plist"
+  $SDKSettings | ConvertTo-JSON -Depth 4 | Out-FIle -FilePath "$(Get-SwiftSDK $OS -Identifier $Identifier)\SDKSettings.json"
+  Write-PList -Settings $SDKSettings -Path "$(Get-SwiftSDK $OS -Identifier $Identifier)\SDKSettings.plist"
 }
 
 function Build-Dispatch([Hashtable] $Platform) {
@@ -3337,6 +3337,7 @@ if (-not $SkipBuild) {
   Install-Platform $WindowsSDKPlatforms Windows
   Write-PlatformInfoPlist Windows
   Write-SDKSettings Windows
+  Write-SDKSettings Windows -Identifier WindowsExperimental
 
   if ($Android) {
     foreach ($Platform in $AndroidSDKPlatforms) {
@@ -3352,6 +3353,7 @@ if (-not $SkipBuild) {
     Install-Platform $AndroidSDKPlatforms Android
     Write-PlatformInfoPlist Android
     Write-SDKSettings Android
+    Write-SDKSettings Android -Identifier AndroidExperimental
 
     # Android swift-inspect only supports 64-bit platforms.
     $AndroidSDKPlatforms | Where-Object { @("arm64-v8a", "x86_64") -contains $_.Architecture.ABI } | ForEach-Object {