[Libguestfs] [PATCH libnbd 0/2] Two patches to make libnbd work on FreeBSD.

Two simple patches which make libnbd compile on FreeBSD. Are we OK to copy common/include/byte-swapping.h from nbdkit? There is no license issue that I know of. Should we put it in lib/ or create a common/ directory? The header file is actually also needed by the tests (follow up patch for that) so putting it in common/ might make more sense. Some notes if you want to compile on FreeBSD: - OCaml is too old to run the generator, so you can't easily build from git. Tarball builds should work, or you can copy the generated files across from a Linux machine. - Running the tests is difficult because there is no nbdkit package for FreeBSD. With a local build of nbdkit you can play with PATH and PKG_CONFIG_PATH to get the tests to work. Rich.