pgsql: Fix use of OPENSSL in SSL tests if command is not found

Fix use of OPENSSL in SSL tests if command is not found `openssl` is an optional dependency in the meson build as it may not be installed in an environment even if SSL libraries are around. The meson scripts assume that, but the SSL tests thought that it was a hard dependency, causing a meson ins

pgsql: Fix use of OPENSSL in SSL tests if command is not found

Fix use of OPENSSL in SSL tests if command is not found `openssl` is an optional dependency in the meson build as it may not be installed in an environment even if SSL libraries are around. The meson scripts assume that, but the SSL tests thought that it was a hard dependency, causing a meson ins