Merge pull request #84308 from compnerd/optionality

build.ps1: make windows SDKs optional

Author: compnerd

utils/build-windows-toolchain.bat

@@ -72,7 +72,7 @@ if not "%SKIP_PACKAGING%"=="1" set "SkipPackagingArg= "
 
 :: Build the -WindowsSDKArchitectures argument, if any, otherwise build all the SDKs.
 set "WindowsSDKArchitecturesArg= "
-if not "%WINDOWS_SDKS%"=="" set "WindowsSDKArchitecturesArg=-WindowsSDKArchitectures %WINDOWS_SDKS%"
+if not "%WINDOWS_SDKS%"=="" set "WindowsSDKArchitecturesArg=-Windows -WindowsSDKArchitectures %WINDOWS_SDKS%"
 
 :: Build the -HostArchName argument, if any.
 set "HostArchNameArg="

utils/build.ps1

@@ -4073,7 +4073,7 @@ if (-not $SkipBuild) {
   Invoke-BuildStep Build-Compilers $HostPlatform -Variant "Asserts"
   $KnownPlatforms.Values | Where-Object {
     switch ($_.OS) {
-      Windows { $true }
+      Windows { $Windows }
       Android { $Android }
       default { $false }
     }