Add #define _GNU_SOURCE to work around what seems to be Perl 5.8.0's problem.  Per recent discussions about plperl failing to build on Linux.
Add #define _GNU_SOURCE to work around what seems to be Perl 5.8.0's
problem.  Per recent discussions about plperl failing to build on Linux.

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