utils: convert System to static

Build System as static as it has been internalised into SPM and no
longer needs to be shared across multiple targets. This reduces the
number of distributed files and helps reduce the binary size (~56KiB).

Author: compnerd

utils/build.ps1

@@ -2182,19 +2182,14 @@ function Build-System($Arch) {
   Build-CMakeProject `
     -Src $SourceCache\swift-system `
     -Bin (Get-HostProjectBinaryCache System) `
-    -InstallTo "$($Arch.ToolchainInstallRoot)\usr" `
     -Arch $Arch `
     -Platform Windows `
     -UseBuiltCompilers C,Swift `
     -SwiftSDK (Get-HostSwiftSDK) `
+    -BuildTargets default `
     -Defines @{
-      BUILD_SHARED_LIBS = "YES";
+      BUILD_SHARED_LIBS = "NO";
     }
-
-  if (-not $ToBatch) {
-    # Remove unnecessary "S:\Program Files\swift\Toolchains\0.0.0+Asserts\usr\include\CSystem"
-    Remove-Item -Force -Recurse "$($Arch.ToolchainInstallRoot)\usr\include\CSystem" -ErrorAction Ignore | Out-Null
-  }
 }
 
 function Build-ToolsSupportCore($Arch) {