Remove HASH_SEGMENT option

It's been unused forever. There's no urgency in removing it now, but
it was just something that caught my eye.

Aleksander Alekseev proposed this a long time ago [0], but Tom Lane
was worried about third-party extensions using it. I believe that's a
non-issue: I tried grepping through all extensions found on github and
didn't find any references to HASH_SEGMENT.

[0] https://www.postgresql.org/message-id/20160418180711.55ac82c0@fujitsu

Reviewed-by: Tomas Vondra <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/dde69621c3248c1c6e623a4f5baa182783ead681

Modified Files
--------------
src/backend/utils/hash/dynahash.c | 65 +++++++++++++--------------------------
src/include/utils/hsearch.h       |  4 +--
2 files changed, 23 insertions(+), 46 deletions(-)

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