pgsql: Remove support for OpenSSL 0.9.8 and 1.0.0

Remove support for OpenSSL 0.9.8 and 1.0.0

Support is out of scope from all the major vendors for these versions
(for example RHEL5 uses a version based on 0.9.8, and RHEL6 uses 1.0.1),
and it created some extra maintenance work. Upstream has stopped
support of 0.9.8 in December 2015 and of 1.0.0 in February 2016.

Since b1abfec, note that the default SSL protocol version set with
ssl_min_protocol_version is TLSv1.2, whose support was added in OpenSSL
1.0.1, so there is no point to enforce ssl_min_protocol_version to TLSv1
in the SSL tests.

Author: Michael Paquier
Reviewed-by: Daniel Gustafsson, Tom Lane
Discussion: https://postgr.es/m/20191205083252.GE5064@paquier.xyz

Branch
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master

Details
-------
https://git.postgresql.org/pg/commitdiff/7b283d0e1d1d79bf1c962d790c94d2a53f3bb38a

Modified Files
--------------
doc/src/sgml/installation.sgml | 2 +-
doc/src/sgml/libpq.sgml | 4 ----
src/backend/libpq/be-secure-openssl.c | 2 --
src/interfaces/libpq/fe-secure-openssl.c | 5 +----
src/test/ssl/t/SSLServer.pm | 4 ----
5 files changed, 2 insertions(+), 15 deletions(-)