Finish wrapping <netdb.h> so that calls go direct and the symbols are all weak

Userland reallocarray() audit.

Avoid potential integer overflow in the size argument of malloc() and
realloc() by using reallocarray() to avoid unchecked multiplication.

ok deraadt@

When fopen()ing internal to libc (the API doesn't support the use
of the resulting FILE *), then pass fopen() the 'e' mode letter to
mark it close-on-exec.

ok miod@

use calloc() to avoid malloc(n * m) overflows; checked by djm canacar jsg

Include limits.h directly instead of depending on another header
to include it for us.

zap rcsid.
split functions off res_debug.c so that getnetnamadr.c does not pull it
all when it's used.

okay deraadt@, krw@

Change return value of reentrant getproto* and getserv* to match the
IBM/Digital API.

Reentrant versions of getprotoent(3) and getservent(3). Adapted from
changes in NetBSD by Christos. OK otto@

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Use strtol() and strtoul() instead of atoi(). This allows us to catch
errors reasonably and deal correctly with unsigned quantities.

Use fgetln(3) instead of fgets(3) so we can easily recognize lines
that are too long and ignore them instead of corrupting later entries.

Fix RCS ids
Make sure everything uses {SYS,}LIBC_SCCS properly

initial import of NetBSD tree