Use "%option prefix" to set API names in ecpg's lexer.

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

Commit: 2bdee07abefee3e59db9f89da635d7ecf9716a7b
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-12-11T23:04:28Z
Releases: 9.3.16
Use "%option prefix" to set API names in ecpg's lexer.

Back-patch commit 92fb64983 into the pre-9.6 branches.

Without this, ecpg fails to build with the latest version of flex.
It's not unreasonable that people would want to compile our old branches
with recent tools.  Per report from Дилян Палаузов.

Discussion: https://postgr.es/m/d845c1af-e18d-6651-178f-9f08cdf37e10@aegee.org

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