Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Repo copy libpthreads to libkse.
This introduces the WITHOUT_LIBKSE nob,
and changes WITHOUT_LIBPTHREADS to mean with neither threading libs.
Approved by: re(kensmith)

Reverse the order of the first two arguments to _sparc64_enter_uts().
The first argument is the UTS function, the second argument is the
first argument to the UTS function. Who's on first.

Convert a couple of hardcoded values to constants. Make thr_getcontext()
return 0 when called the first time, and return 1 when resumed by
thr_setcontext().

Add preliminary sparc64 support to libpthread. This does not
yet work, but hopefully someone familiar with the sparc64
port can pick up the reins.

Submitted by: jake
With mods by: deischen