test-leaks: fix the test with OpenSSL3

Simon Chopin requested to merge schopin/spice:openssl3-testsuite into master

In OpenSSL3, the SSL_accept call now emits proper errors, which we dump before emitting the expected "SSL_accept failed" error message. The g_test_expect_message framework doesn't really allow us to discard messages AFAICT, so instead we add a new expectation with fairly loose criteria.

Fixes #63 (closed)

Signed-off-by: Simon Chopin simon.chopin@canonical.com

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