Completely disable ACL support on NetBSD for now.
Completely disable ACL support on NetBSD for now.

Signed-off-by: Thomas Klausner <4f8f608ac4aafcbe4fab8dcee1e9c609f99d9332@giga.or.at>
[1dc5917c2adeeba13d1ef33dbb40691a1b67cc65@defaultvalue.org: adjust commit message; wrap code.]
Signed-off-by: Rob Browning <1dc5917c2adeeba13d1ef33dbb40691a1b67cc65@defaultvalue.org>

tjanez/bup,mhoeher/bup,tjanez/bup,pombredanne/bup,pombredanne/bup,tjanez/bup,gevaerts/bup,mhoeher/bup,ToxicFrog/bup,mhoeher/bup,gevaerts/bup,ToxicFrog/bup,jbaber/bup,pombredanne/bup,gevaerts/bup,ToxicFrog/bup,jbaber/bup,jbaber/bup,jbaber/bup,jbaber/bup,tjanez/bup,jbaber/bup,pombredanne/bup,tjanez/bup,mhoeher/bup,mhoeher/bup,gevaerts/bup,gevaerts/bup,mhoeher/bup,ToxicFrog/bup,ToxicFrog/bup,pombredanne/bup,tjanez/bup,pombredanne/bup