* miscfuncs.h (NT_readline::close): New function to close handle.

(NT_readline::~NT_readline): Call close.
	* sec_auth.cc (verify_token): Use constructor to initialize tok_usersid.
	* security.h (cygsid::cygsid): Add copy constructor taking cygsid as
	source.

winsup/cygwin/security.h

@@ -222,6 +222,7 @@ public:
   inline cygsid () : cygpsid ((PSID) sbuf), well_known_sid (false) {}
   inline cygsid (const PSID nsid) { *this = nsid; }
   inline cygsid (const char *nstrsid) { *this = nstrsid; }
+  inline cygsid (cygsid &nsid) { *this = nsid; }
 
   inline PSID set () { return psid = (PSID) sbuf; }