Add cpio.h, tar.h, and re_comp.h headers for POSIX & XPG4 conformance

Make grf units 2 and 3.

fix PR/1245.  From Rolf Grossmann <grossman@kiss.informatik.tu-muenchen.de>

Add fd to all; stdin, stdout, and stderr to std

netbsd pr#1806

netbsd pr#1916

Define LD_HINTS_VERSION_2:
- no longer hash on minor version number in hints file.
- add list of ldconfig(8) search directories.

Added 'all' option to create a reasonable amount of standard devices.
Tape devices now called after their kernel names, (ie. ts0, ht0) and
not mt? for all of them. mt? names are kept as symbolic links anyway
so that it don't break anything.

Add an nvram-driver. This driver makes it possible to read/write the
configuration info stored in the nvram on the mc146818

also, always enable identd -- many things expect it now

netbsd pr#1845

at installation time.

complain less in normal situations, and deal better with netgroups, YP,
ssh configuration files, and other rather normal configurations.

the freebsd people have (way nicer)

& copied into two pieces so that use of crypt() pulls in a crypt.o
that contains only that one programmer interface -- this permits USA
export of binaries that use crypt() for authentication purposes.
morecrypt.c contains the other DES programmer interfaces commonly
used.