Fix some unprotected references to AF_UNIX ... wouldn't compile on platforms without AF_UNIX sockets.
Fix some unprotected references to AF_UNIX ... wouldn't compile on
platforms without AF_UNIX sockets.

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