OpenSSL 1.1.0 support

[AlexanderPavlenko]

/usr/local/bundle/gems/ffi-1.9.21/lib/ffi/library.rb:275:in `attach_function':
Function 'SSL_library_init' not found in [libssl.so] (FFI::NotFoundError)
  from /usr/local/bundle/gems/btcruby-1.7/lib/btcruby/openssl.rb:21:in `<module:OpenSSL>'

> openssl version
OpenSSL 1.1.0f  25 May 2017

Reproducible via ruby:2.5.0 Docker image.
Related: lian/bitcoin-ruby#205

[AlexanderPavlenko]

Seems to be fixed by workaround:

ln -nfs /usr/lib/x86_64-linux-gnu/libssl.so.1.0.2 /usr/lib/x86_64-linux-gnu/libssl.so

[xaviablaza]

For Arch:
sudo ln -nfs /usr/lib/libssl.so.1.0.0 /usr/lib/libssl.so

[mtomov]

Thanks @AlexanderPavlenko - really saved the day for CircleCi! Thanks!

[phuongnd08]

Wonder why libssl.so is suffixed with 1.0.2 while openssl version is 1.1.0?

[phuongnd08]

I see so openssl 1.1.0 come with both 1.1 and 1.0.2 shared object and btcruby only work with 1.0.2

[EugZol]

EugZol@9e3378a – try this one

Test suite is passing, but I've done no thorough testing beside that.