Replace the usage of heap_addheader to create pg_attribute tuples with regular

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 03e5248d0f09f46b2fcaff266e7b2f0f997d6cfd
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2008-11-14T01:57:42Z
Releases: 8.4.0
Replace the usage of heap_addheader to create pg_attribute tuples with regular
heap_form_tuple.  Since this removes the last remaining caller of
heap_addheader, remove it.

Extracted from the column privileges patch from Stephen Frost, with further
code cleanups by me.

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