search for: nbdkit_byte_swapping_h

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: -

With these patches, a majority of tests pass. The notable things which are still broken: - Because FreeBSD links /home -> /usr/home, $(pwd) gives a different result from realpath(2). Therefore some tests which implicitly rely on (eg) a plugin which calls nbdkit_realpath internally and then checking that path against $(pwd) fail. - Shebangs (#!) don't seem to work the same way