Remove obsolete debug stuff.
Remove obsolete debug stuff.

* src/npth.c (enter_npth, leave_npth): Remove argument and debug
stuff.
(ENTER, LEAVE): Adjust macros accordingly.
--

The debug calls used c99 style varmarco arguments which is not good
for pre-c99 systems.  The debug stuff is not anymore needed, standard
system trace utilities are better suited for this task.

gpg/npth,gpg/npth