Add "%option warn" to all flex input files that lacked it.

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

Commit: 2e95f1f002bc3f0504dffa6d9ffed0dc914ecec1
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2011-08-25T17:55:57Z
Releases: 9.2.0
Add "%option warn" to all flex input files that lacked it.

This is recommended in the flex manual, and there seems no good reason
not to use it everywhere.

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