Add comment about linker/compiler on bsd.
Add comment about linker/compiler on bsd.

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