Added the use of reference counts to determine when AuthCacheEntries can be deleted. This removes the problem of the entries being deleted while in use.

Also fixed some compiler warnings.

auth_token/client/windows/platform.h

@@ -75,6 +75,7 @@ char printBuff[256];                                           \
 typedef struct _AuthCacheEntry
 {
    LIST_ENTRY  listEntry;
+   int         refCount;
    DWORD       creationTime;
    DWORD       expirationTime;
    BOOL        doesNotExpire;