utils: unlock building swift-inspect

When building for ARM64, we can now build swift-inspect as we use CMake
for the cross-compilation.

This is a second attempt for #77810

Author: hjyamauchi

utils/build.ps1

@@ -2669,8 +2669,7 @@ function Build-Inspect() {
     -Bin (Get-HostProjectBinaryCache SwiftInspect) `
     -InstallTo "$($HostArch.ToolchainInstallRoot)\usr" `
     -Arch $HostArch `
-    -UseBuiltCompilers Swift `
-    -UseSwiftSwiftDriver `
+    -UseBuiltCompilers C,CXX,Swift `
     -SwiftSDK $SDKRoot `
     -Defines @{
       CMAKE_Swift_FLAGS = @("-Xcc", "-I$SDKRoot\usr\include\swift\SwiftRemoteMirror");
@@ -2881,8 +2880,10 @@ if (-not $SkipBuild -and $Allocator -eq "mimalloc") {
   Invoke-BuildStep Build-Mimalloc $HostArch
 }
 
-if (-not $SkipBuild -and -not $IsCrossCompiling) {
+if (-not $SkipBuild) {
   Invoke-BuildStep Build-Inspect $HostArch
+}
+if (-not $SkipBuild -and -not $IsCrossCompiling) {
   Invoke-BuildStep Build-DocC $HostArch
 }