Add FreeBSD support, as well as fix a few bugs found while compiling in FreeBSD #123
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Add FreeBSD support. In most cases, this was just adding a "|| defined (FreeBSD)" next to existing BSD related compile checks.
Add a few missing parenthesis around some macro bodies, which were noticed by the default FreeBSD clang compiler.
Switch the bpf_length to unsigned, instead of signed. The BPF man page for all supported OSes indicates it should be unsigned, and as a buffer length, unsigned makes the most sense.
Fixes #122.