Nix trailing whitespace in files of membars, atomics, and lock stubs.

Will be touching many of these files soon for functional changes.

No functional change intended.

Move SPARC and SPARC64 to modern CPP. Update UPDATING note for this and
Alpha.

Remove clause 3 and 4 from TNF licenses

Use __arch64__ instead of __sparc64__, since -D__sparc64__ is appended
to build option of sparc64 32-bit kernel.

- provide 32 bit versions of the sparc v9 atomic ops.
- use them on sparc64 32 bit kernels.

fixes issues on 32 bit sparc64 kernels that were using sparc v8 ops.
tested by rjs@.

sparc atomic ops