pgsql: Remove INT64_HEX_FORMAT and UINT64_HEX_FORMAT

Remove INT64_HEX_FORMAT and UINT64_HEX_FORMAT

These were introduced (commit efdc7d74753) at the same time as we were
moving to using the standard inttypes.h format macros (commit
a0ed19e0a9e). It doesn't seem useful to keep a new already-deprecated
interface like this with only a few users, so remove the new symbols
again and have the callers use PRIx64.

(Also, INT64_HEX_FORMAT was kind of a misnomer, since hex formats all
use unsigned types.)

Reviewed-by: Nathan Bossart <nathandbossart(at)gmail(dot)com>
Reviewed-by: Thomas Munro <thomas(dot)munro(at)gmail(dot)com>
Discussion: https://www.postgresql.org/message-id/flat/0ac47b5d-e5ab-4cac-98a7-bdee0e2831e4%40eisentraut.org

Branch
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REL_18_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/ce13bb96fbcc3d3dd93b398fba2acf1e70a2080b

Modified Files
--------------
contrib/postgres_fdw/option.c | 2 +-
src/backend/utils/error/csvlog.c | 2 +-
src/backend/utils/error/elog.c | 4 ++--
src/backend/utils/error/jsonlog.c | 2 +-
src/include/c.h | 2 --
src/test/modules/test_radixtree/test_radixtree.c | 2 +-
6 files changed, 6 insertions(+), 8 deletions(-)