pgsql: Added script to check if all rule re-definition in ecpg.addons

Log Message:
-----------
Added script to check if all rule re-definition in ecpg.addons are indeed used
in the build process. If not the build process will stop with an error message.

Modified Files:
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    pgsql/src/interfaces/ecpg/preproc:
        Makefile (r1.146 -> r1.147)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/Makefile?r1=1.146&r2=1.147)

Added Files:
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    pgsql/src/interfaces/ecpg/preproc:
        check_rules.pl (r1.1)

(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/check_rules.pl?rev=1.1&content-type=text/x-cvsweb-markup)