Cleanup for NAMEDATALEN use.

src/backend/access/common/tupdesc.c

src/backend/commands/async.c

src/backend/commands/cluster.c

src/backend/commands/creatinh.c

src/backend/commands/define.c

src/backend/nodes/print.c

src/backend/parser/analyze.c

src/backend/postmaster/postmaster.c

src/backend/storage/smgr/md.c

src/backend/utils/adt/acl.c

src/backend/utils/adt/name.c

src/backend/utils/adt/oidname.c

src/backend/utils/cache/relcache.c

src/bin/psql/psql.c

src/include/storage/buf_internals.h

src/man/sql.l