Make initdb ignore locales for client-only encodings.
Make initdb ignore locales for client-only encodings.

While putting such entries into pg_collation is harmless (since backends
will ignore entries that don't match the database encoding), it's also
useless.

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