pgsql: Merge catalog/pg_foo_fn.h headers back into pg_foo.h headers.

Merge catalog/pg_foo_fn.h headers back into pg_foo.h headers.

Traditionally, include/catalog/pg_foo.h contains extern declarations
for functions in backend/catalog/pg_foo.c, in addition to its function
as the authoritative definition of the pg_foo catalog's rowtype.
In some cases, we'd been forced to split out those extern declarations
into separate pg_foo_fn.h headers so that the catalog definitions
could be #include'd by frontend code. That problem is gone as of
commit 9c0a0de4c, so let's undo the splits to make things less
confusing.

Discussion: https://postgr.es/m/23690.1523031777@sss.pgh.pa.us

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/cefa3871534d2c467a520820c0ae3f002a46d8e4

Modified Files
--------------
contrib/sepgsql/dml.c | 2 +-
src/backend/catalog/dependency.c | 3 -
src/backend/catalog/heap.c | 2 -
src/backend/catalog/index.c | 3 +-
src/backend/catalog/namespace.c | 1 -
src/backend/catalog/objectaddress.c | 1 -
src/backend/catalog/partition.c | 1 -
src/backend/catalog/pg_aggregate.c | 2 -
src/backend/catalog/pg_collation.c | 1 -
src/backend/catalog/pg_constraint.c | 1 -
src/backend/catalog/pg_conversion.c | 1 -
src/backend/catalog/pg_inherits.c | 1 -
src/backend/catalog/pg_operator.c | 1 -
src/backend/catalog/pg_proc.c | 3 +-
src/backend/catalog/pg_type.c | 1 -
src/backend/commands/aggregatecmds.c | 1 -
src/backend/commands/analyze.c | 2 +-
src/backend/commands/collationcmds.c | 1 -
src/backend/commands/conversioncmds.c | 1 -
src/backend/commands/functioncmds.c | 2 -
src/backend/commands/indexcmds.c | 3 +-
src/backend/commands/lockcmds.c | 2 +-
src/backend/commands/operatorcmds.c | 1 -
src/backend/commands/proclang.c | 1 -
src/backend/commands/publicationcmds.c | 2 +-
src/backend/commands/tablecmds.c | 3 -
src/backend/commands/trigger.c | 3 +-
src/backend/commands/typecmds.c | 3 -
src/backend/commands/vacuum.c | 2 +-
src/backend/executor/execPartition.c | 2 +-
src/backend/optimizer/plan/planner.c | 2 +-
src/backend/optimizer/prep/prepunion.c | 2 +-
src/backend/parser/parse_agg.c | 2 +-
src/backend/parser/parse_clause.c | 2 +-
src/backend/parser/parse_coerce.c | 2 +-
src/backend/parser/parse_utilcmd.c | 1 -
src/backend/rewrite/rowsecurity.c | 2 +-
src/backend/tcop/utility.c | 2 +-
src/include/catalog/pg_aggregate.h | 36 ++++++++++
src/include/catalog/pg_aggregate_fn.h | 52 --------------
src/include/catalog/pg_collation.h | 11 +++
src/include/catalog/pg_collation_fn.h | 27 --------
src/include/catalog/pg_constraint.h | 88 +++++++++++++++++++++++
src/include/catalog/pg_constraint_fn.h | 104 ----------------------------
src/include/catalog/pg_conversion.h | 11 +++
src/include/catalog/pg_conversion_fn.h | 27 --------
src/include/catalog/pg_db_role_setting.h | 1 +
src/include/catalog/pg_enum.h | 1 +
src/include/catalog/pg_inherits.h | 14 ++++
src/include/catalog/pg_inherits_fn.h | 30 --------
src/include/catalog/pg_operator.h | 20 ++++++
src/include/catalog/pg_operator_fn.h | 36 ----------
src/include/catalog/pg_proc.h | 34 +++++++++
src/include/catalog/pg_proc_fn.h | 50 -------------
src/include/catalog/pg_publication.h | 1 +
src/include/catalog/pg_replication_origin.h | 1 +
src/include/catalog/pg_subscription.h | 1 +
src/include/catalog/pg_subscription_rel.h | 1 +
src/include/catalog/pg_type.h | 67 ++++++++++++++++++
src/include/catalog/pg_type_fn.h | 84 ----------------------
src/pl/plperl/plperl.c | 1 -
src/pl/plpgsql/src/pl_comp.c | 1 -
src/pl/plpython/plpy_procedure.c | 1 -
63 files changed, 304 insertions(+), 464 deletions(-)