Fix ORCA build, by adding #include required for syscache ids.
Fix ORCA build, by adding #include required for syscache ids.

syscache.h was previously included from parse_oper.h, but I removed that
in commit 8d77fb99. Turns out that gpdbwrappers.c was relying on that
indirect include.

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