pgsql: Clean up references to SQL92

Clean up references to SQL92

In most cases, these were just references to the SQL standard in
general.  In a few cases, a contrast was made between SQL92 and later
standards -- those have been kept unchanged.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/cc26ea9fe2e41e73c955ea75bea7a77fbd062d64

Modified Files
--------------
src/backend/catalog/pg_operator.c          |    6 +++---
src/backend/executor/execMain.c            |    2 +-
src/backend/parser/gram.y                  |   28 +++++++++++++---------------
src/backend/parser/parse_relation.c        |    6 +++---
src/backend/parser/parse_utilcmd.c         |    6 +++---
src/backend/tcop/pquery.c                  |    2 +-
src/backend/utils/adt/date.c               |   10 +++++-----
src/backend/utils/adt/datetime.c           |    4 ++--
src/backend/utils/adt/float.c              |    2 +-
src/backend/utils/adt/like_match.c         |    2 +-
src/backend/utils/adt/numeric.c            |    6 +++---
src/backend/utils/adt/timestamp.c          |    8 ++++----
src/backend/utils/adt/varlena.c            |   12 ++++++------
src/include/nodes/parsenodes.h             |    2 +-
src/include/utils/date.h                   |    2 +-
src/include/utils/timestamp.h              |    2 +-
src/interfaces/ecpg/preproc/pgc.l          |    4 ++--
src/test/regress/expected/boolean.out      |    2 +-
src/test/regress/expected/case.out         |    2 +-
src/test/regress/expected/strings.out      |    8 ++++----
src/test/regress/input/constraints.source  |    2 +-
src/test/regress/output/constraints.source |    2 +-
src/test/regress/sql/boolean.sql           |    2 +-
src/test/regress/sql/case.sql              |    2 +-
src/test/regress/sql/strings.sql           |    8 ++++----
25 files changed, 65 insertions(+), 67 deletions(-)