compat.sh doesn't run TLS 1.2 CCM tests against OpenSSL

[gilles-peskine-arm]

compat.sh doesn't run any interoperability test against OpenSSL with a CCM cipher suite.

Observed in several ways, both in 2.28 and development (and very likely 3.6 as well, but I haven't checked):

• Grab an outcome file from a nightly run and <outcomes.csv grep -E ';compat;(O->m|m->O)' | grep CCM — there are no hits, whereas there are hits for CBC and GCM.
• Run tests/compat.sh -t tls12 (or dtls12) in the default configuration: there are m->m and G->m and m->G tests with CCM and CCM-8, but no m->O or O->m. There are m->O or O->m with other ciphers, but not CCM.

OpenSSL acquired CCM cipher suite support in version 1.1.0, so our default OpenSSL on the CI (the antique OpenSSL 1.0.2g) doesn't have it. But OPENSSL_NEXT (1.1.1a) does have it, so I would expect at least some CCM tests to run.