Fix build error in pg_buffercache on Win32 (native and cygwin). From Mark Kirkwood.
Fix build error in pg_buffercache on Win32 (native and cygwin). From
Mark Kirkwood.

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