`nc_error' variables. Move the nc_lock mutex from mt_misc.c to a
static variable within this function, since it is only used here.
Add a new getnetconfigent() error code `NC_NOTFOUND' to report the
case where the specified netid was not found. Set nc_error in all
error cases in getnetconfigent() so that the error messages returned
by nc_(s)perror are always meaningful.
Add a terminating \n to the output of nc_perror() to match both
our manpage and other implementations of this function.
Reviewed by: deischen, alfred, Martin Blapp <mb@imp.ch>
b3a38fe35a