Fix const cast in get_progname().
Fix const cast in get_progname().

Backpatch.

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