Gerbil build farm failure

I worked with Jim Nasby and we found this is the line that is failing on
Gerbil in the build farm during initdb: tqual.c, line 844 in 8.0.X

if (HeapTupleHeaderGetCmin(tuple) >= snapshot->curcid)

This particular line was last modified in 2002. However, this was a
file that was changed as part of the VACUUM tuple chain commit:

revision 1.81.4.2
date: 2005/08/25 19:45:01; author: tgl; state: Exp; lines: +7 -4
Back-patch fixes for problems with VACUUM destroying t_ctid chains too soon,
and with insufficient paranoia in code that follows t_ctid links.
This patch covers the 8.0 branch.

and the date of the commit to 8.0.X corresponds to the date that
failures started to happen:

http://pgbuildfarm.org/cgi-bin/show_history.pl?nm=gerbil&br=REL8_0_STABLE

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