Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

use PTR_WORD for __curbrk and minbrk instead of .word, the new version
wil support all ABIs.

Approved by: rrs (mentor)

Merge jmallett@'s n64 work into HEAD - changeset 1.

Update libc assembly code to use macros that work on both o32 and n64.
Merge string functions from NetBSD.

The changes are from http://svn.freebsd.org/base/user/jmallett/octeon

Approved by: rrs (mentor), jmallett

Merge r197800 from projects/mips to head by hand:

r197800 | gonzo | 2009-10-06 00:35:52 -0600 (Tue, 06 Oct 2009) | 3 lines
- curbrk variable for sbrk and brk should be the same
- Add correct variable names to Symbol.map

Add mips support libc from the mips2-jnpr branch of perforce.