Add WinSDK.WinSafer

Author: stevapple

stdlib/public/Platform/winsdk.modulemap

@@ -401,6 +401,13 @@ module WinSDK [system] {
     link "AdvAPI32.Lib"
   }
 
+  module WinSafer {
+    header "winsafer.h"
+    export *
+
+    link "AdvAPI32.Lib"
+  }
+
   // TODO(compnerd) does it make sense to implicitly export this API surface?
   // It seems to be meant for device drivers.
   module WLANAPI {