detect xattr support
detect xattr support

(from bernd's tree)

kissthink/unionfs-fuse-1,yogoloth/unionfs-fuse,evnu/unionfs-fuse,evnu/unionfs-fuse,yogoloth/unionfs-fuse,evnu/unionfs-fuse,yogoloth/unionfs-fuse,kissthink/unionfs-fuse-1,kissthink/unionfs-fuse-1