OpenSSL 1.1 compatibility patches

[MarkusTeufelberger]

OpenSSL removed SSL_R_SHORT_READ upstream

See #2047

SSL_R_SHORT_READ was removed in openssl/openssl@45f55f6 about 2.5 years ago.

This still will not allow rippled to build with OpenSSL 1.1.0, but it fixes one of the two main error sites (the other one being src/ripple/basics/impl/make_SSLContext.cpp, see #1914).

Edit: make_SSLContext.cpp is fixed now too, there was only a single problematic function and it tries to set a deprecated flag.

[codecov-io]

Codecov Report

Merging #2126 into develop will increase coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2126      +/-   ##
===========================================
+ Coverage    68.97%   68.98%   +<.01%     
===========================================
  Files          684      684              
  Lines        50394    50394              
===========================================
+ Hits         34761    34762       +1     
+ Misses       15633    15632       -1

Impacted Files	Coverage Δ
src/ripple/basics/impl/make_SSLContext.cpp	52.22% <ø> (-1.28%)	⬇️
src/ripple/beast/asio/ssl_error.h	90.9% <ø> (ø)	⬆️
src/ripple/basics/DecayingSample.h	86.11% <0%> (+8.33%)	⬆️

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[MarkusTeufelberger]

I don't expect this to be merged in this state, but at least it build for me now with OpenSSL 1.1 and it doesn't impact anything since the 2 problematic features that caused compiler errors are deprecated already.

There are still some deprecation warnings left and some functions should maybe anyways be removed - I personally am not going to work on this PR any more than this, since my main goal was to be able to compile rippled on current distributions with OpenSSL 1.1 - and it is already reached.

[MarkusTeufelberger]

Rebased to 0.70.0-b7.

[MarkusTeufelberger]

#2151 is probably the better patch for this, closing this PR.