All guid 'REFxxx' types already have a 'const' inside them.

ole/compobj.c

diff --git a/ole/compobj.c b/ole/compobj.c
index 97e6f46..77a5939 100644
--- a/ole/compobj.c
+++ b/ole/compobj.c
@@ -1155,7 +1155,7 @@
  *           CoGetClassObject [COMPOBJ.7]
  */
 HRESULT WINAPI CoGetClassObject(REFCLSID rclsid, DWORD dwClsContext,
-                        LPVOID pvReserved, const REFIID iid, LPVOID *ppv)
+                        LPVOID pvReserved, REFIID iid, LPVOID *ppv)
 {
     LPUNKNOWN regClassObject;
     char xclsid[50],xiid[50];