Fix syntax error reported by old shells ("if ! command..." is a neologism, apparently).
Fix syntax error reported by old shells ("if ! command..." is a
neologism, apparently).

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