Add VARHDRSZ where needed. Many places just used 4.

src/backend/access/common/printtup.c

src/backend/commands/async.c

src/backend/commands/trigger.c

src/backend/libpq/be-pqexec.c

src/backend/parser/gram.y

src/backend/tcop/dest.c

src/backend/tcop/fastpath.c

src/backend/utils/adt/arrayfuncs.c

src/backend/utils/adt/chunk.c

src/backend/utils/adt/varchar.c

src/backend/utils/adt/varlena.c

src/bin/pg_dump/pg_dump.c

src/bin/psql/psql.c