OS/2 bustage - needs to be in header too

mailnews/imap/src/nsImapFlagAndUidState.h

@@ -71,7 +71,7 @@ public:
 
 private:
     
-  static PRBool FreeCustomFlags(nsHashKey *aKey, void *aData, void *closure);
+  static PRBool PR_CALLBACK FreeCustomFlags(nsHashKey *aKey, void *aData, void *closure);
     PRInt32                 fNumberOfMessagesAdded;
     PRInt32					fNumberOfMessageSlotsAllocated;
 	PRInt32					fNumberDeleted;