crypto: remove most of OpenSSL initcallbacks for 1.1

crypto: remove most of OpenSSL initcallbacks for 1.1

In OpenSSL 1.1 the thread model atomically initialized the library so
there is no need to invoke the init calls, like it was needed for 1.0.2
and earlier. The may be needed for non-standard inits like no-error
strings or so (not the case here). So the ifdef avoids them.

Also, in 1.1 there is no need to teach OpenSSL how to do locking and so
on. Infect, those functions are null-macros as for 1.0.2 compat. So
another ifdef avoids them, too.

I made four function static and removed them the header file since they
don't seem to be used outside of that openssl.c file.

This leaves us the 1.1 init part down to openssl_seed_prng(). I would
actually suggest to get rid of it. OpenSSL is able to gather some
entropy if needed. I don't think reading 2x 1024KiB from system's
entropy on each invocation of the program is wise. But I leave it to
the maintainer to make a decision, I just point it out.

Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>