openssl: stop duplicate ssl key logging for legacy OpenSSL #13683
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For old OpenSSL versions and its forks that do not have support for OpenSSL's keylog callback, libcurl has its own legacy key logging function that logs the TLS 1.2 (and earlier) key (client random + master key) on a single line.
Prior to this change, since e7de80e (not in a release), the legacy key logging function could write the same key line more than once (usually twice) due to some incorrect logic.
Closes #xxxx