'sort' race condition fixes.

Defend against a DoS attack where someone else creates a
temporary file with the same name as ours.  Use mkstemp to do
this, supplying our own mkstemp if the system doesn't have one.

Also, fix a race condition during cleanup on hosts without
sigaction.


(NAME_MAX_IN_DIR): Remove.
(sigprocmask, sigset_t): New macros, defined only on older hosts.
(caught_signals): New var.
(xtmpfopen, tempname): Removed.
(create_temp_file): New function, combining the functions of the old
xtmpfopen and tempname.  All callers changed.
Use mkstemp to create the file.
(sighandler): On hosts without sigaction, ignore signals while
cleaning up, instead of letting them interrupt cleanup.
(main): Initialize caught_signals.  On hosts with sigaction, block all
caught signals while handling one.  Remove duplicate code.

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