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(-)