Recognize __ppc64__, which seems to be Apple's spelling of the predefined symbol for PPC64 hardware.  I hadn't known that Apple supported PPC64 at all, but darn if there aren't 64-bit variant libraries in OS X as well as support in their gcc.
Recognize __ppc64__, which seems to be Apple's spelling of the predefined
symbol for PPC64 hardware.  I hadn't known that Apple supported PPC64 at
all, but darn if there aren't 64-bit variant libraries in OS X as well
as support in their gcc.

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