Process variadic arguments consistently in json functions

json_build_object and json_build_array and the jsonb equivalents did not
correctly process explicit VARIADIC arguments. They are modified to use
the new extract_variadic_args() utility function which abstracts away
the details of the call method.

Michael Paquier, reviewed by Tom Lane and Dmitry Dolgov.

Backpatch to 9.5 for the jsonb fixes and 9.4 for the json fixes, as
that's where they originated.

Branch
------
REL9_5_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/3cc5f0550538e72de5245fa464a18d979278839e

Modified Files
--------------
src/backend/utils/adt/json.c        |  84 ++++++++--------------------
src/backend/utils/adt/jsonb.c       |  97 +++++++++-----------------------
src/test/regress/expected/json.out  | 107 ++++++++++++++++++++++++++++++++++++
src/test/regress/expected/jsonb.out | 105 +++++++++++++++++++++++++++++++++++
src/test/regress/sql/json.sql       |  21 +++++++
src/test/regress/sql/jsonb.sql      |  22 +++++++-
6 files changed, 305 insertions(+), 131 deletions(-)


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