Change t/tindex.py to pass on Mac OS.
Change t/tindex.py to pass on Mac OS.

It turns out /etc is a symlink (to /private/etc) on Mac OS, so checking
that the realpath of t/sampledata/etc is /etc fails.  Instead we now check
against the realpath of /etc.

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