Windows: add an entry for AccCtrl.h

This adjusts the SDK VFS to repair the build on case sensitive file
systems.

Author: compnerd

utils/WindowsSDKVFSOverlay.yaml.in

@@ -29,6 +29,9 @@ roots:
   - name: "@UniversalCRTSdkDir@/Include/@UCRTVersion@/um"
     type: directory
     contents:
+      - name: accctrl.h
+        type: file
+        external-contents: "@UniversalCRTSdkDir@/Include/@UCRTVersion@/um/AccCtrl.h"
       - name: commctrl.h
         type: file
         external-contents: "@UniversalCRTSdkDir@/Include/@UCRTVersion@/um/CommCtrl.h"