doc: PQinitOpenSSL and PQinitSSL are obsolete in OpenSSL 1.1.0+

Starting with OpenSSL 1.1.0 there is no need to call PQinitOpenSSL
or PQinitSSL to avoid duplicate initialization of OpenSSL.  Add a
note to the documentation to explain this.

Backpatch to all supported versions as older OpenSSL versions are
equally likely to be used for all branches.

Reported-by: Sebastien Flaesch <sebastien.flae...@4js.com>
Reviewed-by: Tom Lane <t...@sss.pgh.pa.us>
Discussion: 
https://postgr.es/m/dbap191mb12895bffec4b5fe0460d0f2fb0...@dbap191mb1289.eurp191.prod.outlook.com
Backpatch-through: 11, all supported versions

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/928e05ddfd4031c67e101c5e74dbb5c8ec4f9e23

Modified Files
--------------
doc/src/sgml/libpq.sgml | 2 ++
1 file changed, 2 insertions(+)

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