Changed the way symbols are defined in C in INFORMIX mode.

Michael Meskes <meskes@postgresql.org>

Commit: bea0466d9dc099f1fda28f5714e83ad9a1b23034
Author: Michael Meskes <meskes@postgresql.org>
Date: 2008-02-15T12:11:02Z
Releases: 8.3.1
Changed the way symbols are defined in C in INFORMIX mode.
Added SQLSTATE macro closing bug #3961.
EXECUTE can return NOT FOUND so it should be checked here too.

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