Move atooid() definition to a central place

contrib/lo/lo.c

contrib/vacuumlo/vacuumlo.c

src/backend/bootstrap/bootparse.y

src/backend/libpq/hba.c

src/backend/nodes/readfuncs.c

src/backend/utils/adt/misc.c

src/bin/pg_basebackup/pg_basebackup.c

src/bin/pg_upgrade/pg_upgrade.h

src/bin/psql/common.h

src/bin/scripts/droplang.c

src/include/fe_utils/string_utils.h

src/include/postgres_ext.h