Make all our flex and bison files use %option prefix or %name-prefix

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

Commit: fb51ad3419ea84d7ad23edbc931e1b575c803e2a
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2006-03-07T01:03:12Z
Releases: 8.2.0
Make all our flex and bison files use %option prefix or %name-prefix
(respectively) to rename yylex and related symbols.  Some were doing
it this way already, while others used not-too-reliable sed hacks in
the Makefiles.  It's all nice and consistent now.

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