macchanger: new package

Signed-off-by: Simon Dawson <spdawson@gmail.com>

Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Tested-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
  (build-test with a WCHAR-only internal powerpc toolchain)
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>