Undo commenting of OPENSSL_NO_RFC3779

Undo commenting of OPENSSL_NO_RFC3779

The define implies that we have the RFC 3779 API and corresponding
symbols publicly exposed. We don't do that since there are still
concerns about its suitability and security. oss-fuzz has code
depending on this define and this broke its build as tracked down
by jsing. This commit gets us oss-fuzz builds back while keeping
job happy since the extension pretty printing will continue to work.

ok jsing