[PATCH] Support OpenBSD

[Ethan Glasser-Camp]

Austin Clements <amdragon at MIT.EDU> writes:

> OpenBSD's build flags are identical to FreeBSD, except that libraries
> need to be explicitly linked against libc.  No code changes are
> necessary.
>
> From: Cody Cutler <ccutler at csail.mit.edu>
> ---

OK, looks fine.

Ethan