Use a more portable technique for unsetting environment variables, and unset PGCLIENTENCODING to prevent backend from dying if it's set to something incompatible with the -E option.
Use a more portable technique for unsetting environment variables,
and unset PGCLIENTENCODING to prevent backend from dying if it's set
to something incompatible with the -E option.

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