Avoid warnings in tests when openssl binary isn't available

The SSL tests for pg_stat_ssl tries to exactly match the serial
from the certificate by extracting it with the openssl binary.
If that fails due to the binary not being available, a fallback
match is used, but the attempt to execute a missing binary adds
a warning to the output which can confuse readers for a failure
in the test.  Fix by only attempting if the openssl binary was
found by autoconf/meson.

Backpatch down to v16 where commit c8e4030d1bdd made the test
use the OPENSSL variable from autoconf/meson instead of a hard-
coded value.

Author: Daniel Gustafsson <[email protected]>
Reported-by: Christoph Berg <[email protected]>
Discussion: https://postgr.es/m/[email protected]
Backpatch-through: 16

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/bf5b26525b28a2abf8eef368921c12fdeaddc0d8

Modified Files
--------------
src/test/ssl/t/001_ssltests.pl | 40 +++++++++++++++++++---------------------
1 file changed, 19 insertions(+), 21 deletions(-)

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