some unused parameters cleanup

Here is a series of patches to remove some unused function parameters. 
In each case, the need for them was removed by some other code changes 
over time but the unusedness was not noticed.  I have included a 
reference to when they became unused in each case.

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services