Fix error messages for FreeFile in COPY command. They are extracted from COPY API patch.
Fix error messages for FreeFile in COPY command.
They are extracted from COPY API patch.

suggested by Noah Misch

tpostgres-projects/tPostgres,techdragon/Postgres-XL,greenplum-db/gpdb,yazun/postgres-xl,zeroae/postgres-xl,postmind-net/postgres-xl,jmcatamney/gpdb,jmcatamney/gpdb,pavanvd/postgres-xl,lisakowen/gpdb,arcivanov/postgres-xl,kmjungersen/PostgresXL,lisakowen/gpdb,techdragon/Postgres-XL,snaga/postgres-xl,adam8157/gpdb,lisakowen/gpdb,jmcatamney/gpdb,xinzweb/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,techdragon/Postgres-XL,xinzweb/gpdb,arcivanov/postgres-xl,jmcatamney/gpdb,tpostgres-projects/tPostgres,greenplum-db/gpdb,xinzweb/gpdb,pavanvd/postgres-xl,snaga/postgres-xl,adam8157/gpdb,arcivanov/postgres-xl,yazun/postgres-xl,oberstet/postgres-xl,adam8157/gpdb,tpostgres-projects/tPostgres,ashwinstar/gpdb,lisakowen/gpdb,50wu/gpdb,xinzweb/gpdb,xinzweb/gpdb,xinzweb/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,snaga/postgres-xl,oberstet/postgres-xl,zeroae/postgres-xl,ovr/postgres-xl,50wu/gpdb,snaga/postgres-xl,lisakowen/gpdb,techdragon/Postgres-XL,greenplum-db/gpdb,Postgres-XL/Postgres-XL,kmjungersen/PostgresXL,adam8157/gpdb,jmcatamney/gpdb,adam8157/gpdb,50wu/gpdb,jmcatamney/gpdb,ovr/postgres-xl,adam8157/gpdb,50wu/gpdb,pavanvd/postgres-xl,ashwinstar/gpdb,greenplum-db/gpdb,zeroae/postgres-xl,xinzweb/gpdb,snaga/postgres-xl,adam8157/gpdb,50wu/gpdb,lisakowen/gpdb,50wu/gpdb,arcivanov/postgres-xl,yazun/postgres-xl,Postgres-XL/Postgres-XL,Postgres-XL/Postgres-XL,oberstet/postgres-xl,lisakowen/gpdb,techdragon/Postgres-XL,kmjungersen/PostgresXL,zeroae/postgres-xl,oberstet/postgres-xl,postmind-net/postgres-xl,ovr/postgres-xl,tpostgres-projects/tPostgres,jmcatamney/gpdb,ovr/postgres-xl,kmjungersen/PostgresXL,jmcatamney/gpdb,Postgres-XL/Postgres-XL,postmind-net/postgres-xl,ashwinstar/gpdb,lisakowen/gpdb,ovr/postgres-xl,postmind-net/postgres-xl,tpostgres-projects/tPostgres,postmind-net/postgres-xl,pavanvd/postgres-xl,kmjungersen/PostgresXL,yazun/postgres-xl,greenplum-db/gpdb,Postgres-XL/Postgres-XL,zeroae/postgres-xl,adam8157/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,oberstet/postgres-xl,50wu/gpdb,pavanvd/postgres-xl,ashwinstar/gpdb,arcivanov/postgres-xl,50wu/gpdb,ashwinstar/gpdb,xinzweb/gpdb,arcivanov/postgres-xl,yazun/postgres-xl