pkg sysutils/bacula : build works with 5.0.2

[Jan Lentfer]

I submitted a PR to have --disable-xattr set on DragonFly. This will 
unbreak the build on DF. I asked to have this backported to 2010Q1, 
also. Let's wait and see what happens.

http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=43312