pgsql: Skip RSA-PSS ssl test when using LibreSSL.

Skip RSA-PSS ssl test when using LibreSSL.

Presently, LibreSSL does not have working support for RSA-PSS,
so disable that test.  Per discussion at
https://marc.info/?l=libressl&m=174664225002441&w=2
they do intend to fix this, but it's a ways off yet.

Reported-by: Thomas Munro <thomas.munro@gmail.com>
Author: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://postgr.es/m/CA+hUKG+fLqyweHqFSBcErueUVT0vDuSNWui-ySz3+d_APmq7dw@mail.gmail.com
Backpatch-through: 15

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/cad781b3e5de615e8a570950e455bd04cdadeafd

Modified Files
--------------
src/test/ssl/t/002_scram.pl | 7 +++++++
1 file changed, 7 insertions(+)