More cleanups by "Kurt J. Lidl" <lidl@va.pubnix.com>

src/backend/access/sdir.h

src/backend/executor/execMain.c

src/backend/executor/execdefs.h

src/backend/executor/nodeMaterial.c

src/backend/executor/nodeSort.c

src/backend/storage/buffer/buf_table.c

src/backend/storage/lmgr/lock.c

src/backend/utils/builtins.h

src/bin/psql/rlstubs.c