Add a HAVE_TZSET define to clean up defines in backend/utils/adt/nabstime.c
Add a HAVE_TZSET define to clean up defines in backend/utils/adt/nabstime.c

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