Remove unused global variable.
Remove unused global variable.

In commit 3a795d254c, I refactored things so that it was left unused, but I
failed to actually remove it then.

edespino/gpdb,Chibin/gpdb,edespino/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,janebeckman/gpdb,yuanzhao/gpdb,Chibin/gpdb,rvs/gpdb,kaknikhil/gpdb,edespino/gpdb,Chibin/gpdb,Chibin/gpdb,Chibin/gpdb,jmcatamney/gpdb,50wu/gpdb,greenplum-db/gpdb,lisakowen/gpdb,adam8157/gpdb,Chibin/gpdb,edespino/gpdb,Quikling/gpdb,greenplum-db/gpdb,rvs/gpdb,kaknikhil/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,janebeckman/gpdb,kaknikhil/gpdb,rvs/gpdb,jmcatamney/gpdb,edespino/gpdb,Quikling/gpdb,lisakowen/gpdb,ashwinstar/gpdb,xinzweb/gpdb,kaknikhil/gpdb,Quikling/gpdb,janebeckman/gpdb,Quikling/gpdb,kaknikhil/gpdb,cjcjameson/gpdb,greenplum-db/gpdb,Chibin/gpdb,Chibin/gpdb,kaknikhil/gpdb,ashwinstar/gpdb,rvs/gpdb,ashwinstar/gpdb,ashwinstar/gpdb,Quikling/gpdb,xinzweb/gpdb,Chibin/gpdb,cjcjameson/gpdb,lisakowen/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,adam8157/gpdb,ashwinstar/gpdb,cjcjameson/gpdb,cjcjameson/gpdb,cjcjameson/gpdb,50wu/gpdb,Quikling/gpdb,xinzweb/gpdb,yuanzhao/gpdb,50wu/gpdb,edespino/gpdb,yuanzhao/gpdb,lisakowen/gpdb,Quikling/gpdb,yuanzhao/gpdb,greenplum-db/gpdb,janebeckman/gpdb,janebeckman/gpdb,jmcatamney/gpdb,adam8157/gpdb,lisakowen/gpdb,Quikling/gpdb,yuanzhao/gpdb,edespino/gpdb,cjcjameson/gpdb,rvs/gpdb,kaknikhil/gpdb,edespino/gpdb,yuanzhao/gpdb,adam8157/gpdb,ashwinstar/gpdb,edespino/gpdb,lisakowen/gpdb,yuanzhao/gpdb,Chibin/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,rvs/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,edespino/gpdb,xinzweb/gpdb,xinzweb/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,janebeckman/gpdb,kaknikhil/gpdb,xinzweb/gpdb,rvs/gpdb,50wu/gpdb,cjcjameson/gpdb,Quikling/gpdb,adam8157/gpdb,adam8157/gpdb,rvs/gpdb,jmcatamney/gpdb,rvs/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,janebeckman/gpdb,Quikling/gpdb,janebeckman/gpdb,adam8157/gpdb,cjcjameson/gpdb,lisakowen/gpdb,adam8157/gpdb,yuanzhao/gpdb,50wu/gpdb,rvs/gpdb,50wu/gpdb,xinzweb/gpdb,xinzweb/gpdb,50wu/gpdb,janebeckman/gpdb,yuanzhao/gpdb,50wu/gpdb,lisakowen/gpdb,janebeckman/gpdb