pgsql: Remove trailing slash use in ecpg regression script; caused

Log Message:
-----------
Remove trailing slash use in ecpg regression script; caused failures on
some platforms.

Modified Files:
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pgsql/src/interfaces/ecpg/test:
pg_regress.sh (r1.9 -> r1.10)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/pg_regress.sh.diff?r1=1.9&r2=1.10)