Add AIX shared library support item to release notes.
Add AIX shared library support item to release notes.

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