Also:
- Change version scheme again to match upstream's change.
- New source URL on github.
- Drop upstreamed patch to fix detection of s390x as 64-bit arch.
Also:
- Fix the mfence patch to actually emit a memory barrier (bz 1288314).
- Build an sse2 version for i386 for better performance on capable CPUs.
- Enable use of C++0x features.
- Drop out-of-date CHANGES.txt from git.