Remove the recently added node types ReloptElem and OptionDefElem in favor

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 090173a3f937952b2a5c6d92a3ab139e79ca3033
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2009-04-04T21:12:31Z
Releases: 8.4.0
Remove the recently added node types ReloptElem and OptionDefElem in favor
of adding optional namespace and action fields to DefElem.  Having three
node types that do essentially the same thing bloats the code and leads
to errors of confusion, such as in yesterday's bug report from Khee Chin.

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