- Sort xrefs by section, and then alphabetically.
- Add missing commas between xref items.
- Remove commas from the last xref entry.
- Remove duplicate entries.

of the src string if len(src) >= size.  Speeds up the common case a bit.

Submitted by: Lawrence D. Lopez <lopez@cisco.com>

All POSIX libc api now there (to P1003.1c/D10)
(more md stuff is needed for other libc/arch/*)
(setlogin is no longer a special syscall)
Add -pthread option to gcc (that makes it use -lc_r and -D_POSIX_THREADS).
Doc some re-entrant routines
Add libc_r to intro(3)
dig() uses some libc srcs and an extra -I was needed there.
Add more md stuff to libc_r.
Update includes for the pthreads api
Update libc_r TODO

then/than and such. Other miscellaneous problems fixed across these source
files.

occurrences squashed as well.

making load/store architectures (like mips&alpha) fail whn compiled with
gcc -O2.

Solar Designer <solar@false.com> some time ago.

header files from the correct path.

Man pages will come soon, I hope.

to simulate a crypt, like login does.
Use SEEK_* not L_* and kill some 0L's used in lseek while we're there.

empty but the old one is not and ut_line and ut_name match, preserve
the old ut_line.  Fixes PR #516