Fix portability issue in pg_audit.
Fix portability issue in pg_audit.

"%ld" is not a portable way to print int64's.  This may explain the
buildfarm crashes we're seeing --- it seems to make dromedary happy,
at least.

yazun/postgres-xl,adam8157/gpdb,xinzweb/gpdb,techdragon/Postgres-XL,pavanvd/postgres-xl,50wu/gpdb,ashwinstar/gpdb,50wu/gpdb,Postgres-XL/Postgres-XL,pavanvd/postgres-xl,adam8157/gpdb,ashwinstar/gpdb,50wu/gpdb,jmcatamney/gpdb,techdragon/Postgres-XL,ovr/postgres-xl,Postgres-XL/Postgres-XL,xinzweb/gpdb,ashwinstar/gpdb,oberstet/postgres-xl,lisakowen/gpdb,lisakowen/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,xinzweb/gpdb,techdragon/Postgres-XL,adam8157/gpdb,Postgres-XL/Postgres-XL,ashwinstar/gpdb,50wu/gpdb,jmcatamney/gpdb,zeroae/postgres-xl,Postgres-XL/Postgres-XL,oberstet/postgres-xl,zeroae/postgres-xl,ovr/postgres-xl,greenplum-db/gpdb,50wu/gpdb,ashwinstar/gpdb,zeroae/postgres-xl,zeroae/postgres-xl,jmcatamney/gpdb,xinzweb/gpdb,techdragon/Postgres-XL,jmcatamney/gpdb,jmcatamney/gpdb,techdragon/Postgres-XL,pavanvd/postgres-xl,greenplum-db/gpdb,lisakowen/gpdb,greenplum-db/gpdb,xinzweb/gpdb,greenplum-db/gpdb,oberstet/postgres-xl,Postgres-XL/Postgres-XL,oberstet/postgres-xl,ashwinstar/gpdb,pavanvd/postgres-xl,yazun/postgres-xl,pavanvd/postgres-xl,lisakowen/gpdb,adam8157/gpdb,50wu/gpdb,lisakowen/gpdb,50wu/gpdb,yazun/postgres-xl,yazun/postgres-xl,oberstet/postgres-xl,xinzweb/gpdb,lisakowen/gpdb,adam8157/gpdb,xinzweb/gpdb,lisakowen/gpdb,50wu/gpdb,adam8157/gpdb,yazun/postgres-xl,zeroae/postgres-xl,greenplum-db/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,xinzweb/gpdb,ovr/postgres-xl,ashwinstar/gpdb,ovr/postgres-xl,adam8157/gpdb,ovr/postgres-xl,adam8157/gpdb,lisakowen/gpdb,jmcatamney/gpdb