Added a close_handle method to the object operations, and use it to
implement registry notifications and the strange behavior of
CloseHandle on winstation/desktop handles.

diff --git a/server/token.c b/server/token.c
index ca1a7ff..0c11edf 100644
--- a/server/token.c
+++ b/server/token.c
@@ -109,6 +109,7 @@
     NULL,                      /* satisfied */
     no_signal,                 /* signal */
     no_get_fd,                 /* get_fd */
+    no_close_handle,           /* close_handle */
     token_destroy              /* destroy */
 };