pgsql: Repair possible failure to update hint bits back to disk, per

Log Message:
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Repair possible failure to update hint bits back to disk, per
http://archives.postgresql.org/pgsql-hackers/2004-10/msg00464.php.
I plan a more permanent fix in HEAD, but for the back branches it seems
best to just touch the places that actually have a problem.

Tags:
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REL7_3_STABLE

Modified Files:
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    pgsql/contrib/pgstattuple:
        pgstattuple.c (r1.9 -> r1.9.2.1)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgstattuple/pgstattuple.c.diff?r1=1.9&r2=1.9.2.1)
    pgsql/src/backend/access/heap:
        heapam.c (r1.149 -> r1.149.2.1)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/heap/heapam.c.diff?r1=1.149&r2=1.149.2.1)
    pgsql/src/backend/utils/adt:
        ri_triggers.c (r1.43.2.4 -> r1.43.2.5)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/ri_triggers.c.diff?r1=1.43.2.4&r2=1.43.2.5)