Throughout, call fcntl64 instead of fcntl or fcntl_worker.

* fcntl.cc (fcntl_worker): Remove.
	(fcntl64): Add fault handler.  Move fcntl_worker stuff here.  Add case
	for locking and call fhandler's lock method directly.  Make sure that
	F_FLOCK flag isn't set in lock call.
	(_fcntl): Add fault handler.
	* fhandler.cc (fhandler_base::fcntl): Drop lock cases.
	* flock.cc (flock): Add fault handler.  Simplify code.  Call fhandlers
	lock method directly instead of fcntl_worker.  Add debug output.
	(lockf): Add fault handler.  Call fhandlers lock method directly
	instead of fcntl_worker.  Add debug output.
	* winsup.h (fcntl_worker): Drop declaration.
	(fcntl64): Declare.

winsup/cygwin/syslog.cc

@@ -217,7 +217,7 @@ connect_syslogd ()
   else
     syslogd_inited = inited_dgram;
   syslogd_sock = fd;
-  fcntl (syslogd_sock, F_SETFD, FD_CLOEXEC);
+  fcntl64 (syslogd_sock, F_SETFD, FD_CLOEXEC);
   return;
 }