Log Message:
Update to 0.32. From the changelog:

- remove OpenBSD #warning (obsd maintainer says no longer needed)
- fix fmt_ip6 (Erwin Hoffmann)
- add MSG_ZEROCOPY support (only used for buffers >8k)
- use writev in buffer_put for a slight perf improvement
- add experimental iom API for multithreaded I/O multiplexing (in io.h)