OpenSSL-related compilation fixes #6407
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Description
This fixes some compatibility issues with OpenSSL versions. In a new OpenSSL version, some struct definitions are now removed from header files, their implementation details abstracted away.
I suppose this fix should be backported to v2.3.x and v2.4.x as well as merged into next.
I think that BN_ext_get_uint64 and BN_ext_count_low_zero_bits could use a unit test before this change gets accepted, because I actually have not tested them in any way.