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96f5baecec
Our interoperability tests fail with a recent OpenSSL server. The reason is that they force 1024-bit Diffie-Hellman parameters, which recent OpenSSL (e.g. 1.1.1f on Ubuntu 20.04) reject: ``` 140072814650688:error:1408518A:SSL routines:ssl3_ctx_ctrl:dh key too small:../ssl/s3_lib.c:3782: ``` We've been passing custom DH parameters since 6195767554da332e9f81e6510b07f7565ff8a538 because OpenSSL <=1.0.2a requires it. This is only concerns the version we use as OPENSSL_LEGACY. So only use custom DH parameters for that version. In compat.sh, use it based on the observed version of $OPENSSL_CMD. This way, ssl-opt.sh and compat.sh work (barring other issues) for all our reference versions of OpenSSL as well as for a modern system OpenSSL. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>