Platform: link against ComCtl32 when using Common Controls

This adds a missing link directive to the ComCtl32 module.  This allows
use of the module without requiring the user to explicitly add the
linked library to the target when building code against this module.

Author: compnerd

stdlib/public/Platform/winsdk.modulemap

@@ -148,6 +148,8 @@ module WinSDK [system] {
     module CommCtrl {
       header "CommCtrl.h"
       export *
+
+      link "ComCtl32.Lib"
     }
 
     module CommDlg {