Fix breakage for pltcl modules. pg_get_enconv_by_encoding() has been changed since CREATE CONVERSION supported.
Fix breakage for pltcl modules. pg_get_enconv_by_encoding() has been
changed since CREATE CONVERSION supported.

tangp3/gpdb,lpetrov-pivotal/gpdb,chrishajas/gpdb,royc1/gpdb,jmcatamney/gpdb,chrishajas/gpdb,xinzweb/gpdb,greenplum-db/gpdb,rubikloud/gpdb,arcivanov/postgres-xl,randomtask1155/gpdb,atris/gpdb,oberstet/postgres-xl,lintzc/gpdb,royc1/gpdb,lisakowen/gpdb,ashwinstar/gpdb,Chibin/gpdb,rvs/gpdb,xinzweb/gpdb,jmcatamney/gpdb,Quikling/gpdb,cjcjameson/gpdb,Quikling/gpdb,lpetrov-pivotal/gpdb,kaknikhil/gpdb,Chibin/gpdb,arcivanov/postgres-xl,0x0FFF/gpdb,ahachete/gpdb,adam8157/gpdb,techdragon/Postgres-XL,edespino/gpdb,50wu/gpdb,tpostgres-projects/tPostgres,lintzc/gpdb,adam8157/gpdb,postmind-net/postgres-xl,rubikloud/gpdb,lpetrov-pivotal/gpdb,rvs/gpdb,xinzweb/gpdb,xinzweb/gpdb,Chibin/gpdb,lisakowen/gpdb,kaknikhil/gpdb,rvs/gpdb,edespino/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,0x0FFF/gpdb,xuegang/gpdb,cjcjameson/gpdb,xinzweb/gpdb,janebeckman/gpdb,Quikling/gpdb,lintzc/gpdb,tpostgres-projects/tPostgres,royc1/gpdb,xuegang/gpdb,randomtask1155/gpdb,foyzur/gpdb,zaksoup/gpdb,xinzweb/gpdb,lintzc/gpdb,pavanvd/postgres-xl,kaknikhil/gpdb,greenplum-db/gpdb,ahachete/gpdb,adam8157/gpdb,randomtask1155/gpdb,CraigHarris/gpdb,yuanzhao/gpdb,Quikling/gpdb,Postgres-XL/Postgres-XL,techdragon/Postgres-XL,zaksoup/gpdb,edespino/gpdb,yuanzhao/gpdb,atris/gpdb,janebeckman/gpdb,50wu/gpdb,Quikling/gpdb,CraigHarris/gpdb,yuanzhao/gpdb,lpetrov-pivotal/gpdb,chrishajas/gpdb,snaga/postgres-xl,randomtask1155/gpdb,kmjungersen/PostgresXL,rvs/gpdb,tangp3/gpdb,yazun/postgres-xl,Chibin/gpdb,zaksoup/gpdb,Postgres-XL/Postgres-XL,cjcjameson/gpdb,snaga/postgres-xl,atris/gpdb,zaksoup/gpdb,tangp3/gpdb,50wu/gpdb,greenplum-db/gpdb,kaknikhil/gpdb,janebeckman/gpdb,lintzc/gpdb,rubikloud/gpdb,ashwinstar/gpdb,ashwinstar/gpdb,snaga/postgres-xl,yuanzhao/gpdb,zaksoup/gpdb,arcivanov/postgres-xl,jmcatamney/gpdb,lpetrov-pivotal/gpdb,zeroae/postgres-xl,janebeckman/gpdb,kaknikhil/gpdb,ovr/postgres-xl,0x0FFF/gpdb,rvs/gpdb,xuegang/gpdb,yazun/postgres-xl,CraigHarris/gpdb,lpetrov-pivotal/gpdb,lisakowen/gpdb,50wu/gpdb,tangp3/gpdb,Chibin/gpdb,postmind-net/postgres-xl,arcivanov/postgres-xl,rvs/gpdb,CraigHarris/gpdb,xuegang/gpdb,janebeckman/gpdb,oberstet/postgres-xl,yuanzhao/gpdb,chrishajas/gpdb,CraigHarris/gpdb,snaga/postgres-xl,adam8157/gpdb,rubikloud/gpdb,kmjungersen/PostgresXL,adam8157/gpdb,chrishajas/gpdb,janebeckman/gpdb,ashwinstar/gpdb,cjcjameson/gpdb,zeroae/postgres-xl,rubikloud/gpdb,cjcjameson/gpdb,cjcjameson/gpdb,Quikling/gpdb,lisakowen/gpdb,lisakowen/gpdb,atris/gpdb,0x0FFF/gpdb,xinzweb/gpdb,edespino/gpdb,chrishajas/gpdb,rubikloud/gpdb,Chibin/gpdb,Postgres-XL/Postgres-XL,50wu/gpdb,lintzc/gpdb,Quikling/gpdb,royc1/gpdb,postmind-net/postgres-xl,greenplum-db/gpdb,kaknikhil/gpdb,cjcjameson/gpdb,xuegang/gpdb,chrishajas/gpdb,royc1/gpdb,snaga/postgres-xl,kmjungersen/PostgresXL,tangp3/gpdb,ovr/postgres-xl,edespino/gpdb,CraigHarris/gpdb,CraigHarris/gpdb,zaksoup/gpdb,pavanvd/postgres-xl,lintzc/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,lintzc/gpdb,postmind-net/postgres-xl,atris/gpdb,randomtask1155/gpdb,oberstet/postgres-xl,zeroae/postgres-xl,Chibin/gpdb,0x0FFF/gpdb,royc1/gpdb,foyzur/gpdb,edespino/gpdb,tpostgres-projects/tPostgres,kaknikhil/gpdb,kmjungersen/PostgresXL,ahachete/gpdb,xuegang/gpdb,kmjungersen/PostgresXL,Chibin/gpdb,xuegang/gpdb,ahachete/gpdb,edespino/gpdb,ashwinstar/gpdb,Postgres-XL/Postgres-XL,greenplum-db/gpdb,edespino/gpdb,ahachete/gpdb,lisakowen/gpdb,yuanzhao/gpdb,ovr/postgres-xl,adam8157/gpdb,ahachete/gpdb,lpetrov-pivotal/gpdb,yazun/postgres-xl,janebeckman/gpdb,zeroae/postgres-xl,ashwinstar/gpdb,atris/gpdb,randomtask1155/gpdb,rvs/gpdb,0x0FFF/gpdb,yuanzhao/gpdb,lintzc/gpdb,greenplum-db/gpdb,rvs/gpdb,kaknikhil/gpdb,rvs/gpdb,chrishajas/gpdb,zaksoup/gpdb,zaksoup/gpdb,adam8157/gpdb,randomtask1155/gpdb,atris/gpdb,tangp3/gpdb,jmcatamney/gpdb,janebeckman/gpdb,randomtask1155/gpdb,rubikloud/gpdb,foyzur/gpdb,tpostgres-projects/tPostgres,yuanzhao/gpdb,royc1/gpdb,yazun/postgres-xl,lisakowen/gpdb,janebeckman/gpdb,royc1/gpdb,adam8157/gpdb,pavanvd/postgres-xl,tangp3/gpdb,cjcjameson/gpdb,Chibin/gpdb,Quikling/gpdb,techdragon/Postgres-XL,janebeckman/gpdb,foyzur/gpdb,Chibin/gpdb,arcivanov/postgres-xl,tpostgres-projects/tPostgres,ahachete/gpdb,foyzur/gpdb,edespino/gpdb,postmind-net/postgres-xl,edespino/gpdb,rubikloud/gpdb,arcivanov/postgres-xl,tangp3/gpdb,CraigHarris/gpdb,xinzweb/gpdb,xuegang/gpdb,pavanvd/postgres-xl,50wu/gpdb,CraigHarris/gpdb,ashwinstar/gpdb,yuanzhao/gpdb,Postgres-XL/Postgres-XL,jmcatamney/gpdb,ovr/postgres-xl,techdragon/Postgres-XL,Quikling/gpdb,jmcatamney/gpdb,foyzur/gpdb,ovr/postgres-xl,pavanvd/postgres-xl,atris/gpdb,Quikling/gpdb,greenplum-db/gpdb,rvs/gpdb,techdragon/Postgres-XL,cjcjameson/gpdb,kaknikhil/gpdb,jmcatamney/gpdb,foyzur/gpdb,ahachete/gpdb,lisakowen/gpdb,oberstet/postgres-xl,oberstet/postgres-xl,0x0FFF/gpdb,0x0FFF/gpdb,lpetrov-pivotal/gpdb,50wu/gpdb,foyzur/gpdb,yazun/postgres-xl,jmcatamney/gpdb,zeroae/postgres-xl,yuanzhao/gpdb,xuegang/gpdb,50wu/gpdb