• Fix the repository URL in Makefile.PL (git:// rather than git@),
  which was preventing it from being added to META.json. Thanks to
  Dan Book.
  
• When building Net-SSLeay, exit if an OpenSSL executable cannot be
  found in PATH. Fixes RT#131060. Thanks to Nigel Horne for the report.
  
• Remove non-OCSP external tests, many of which unnecessarily duplicate
  local tests or fail for reasons outside of our control. Fixes
  RT#129542. Thanks to Andreas Vögele for the bug report that
  ultimately led to this change.
  
• Add support for LibreSSL on Windows when built with Visual C++.
  Thanks to Graham Ollis for the patch.
  
• In SSL_CTX_free() and SSL_free(), clean callback-related data from
  the global hash after freeing ctx, not before. This allows callbacks
  to be executed during freeing. Thanks to Steffen Ullrich for the
  patch.
  
• t/local/07_sslecho.t started failing with OpenSSL 1.1.1e. Updated
  the test file with missing calls to Net::SSLeay::shutdown(). Also
  added one call in SSLeay.pm sslcat() function. Enabling SSLeay trace
  level 3 showed 'unexpected eof while reading' errors which were added
  to OpenSSL with commit db943f43. This fixes GitHub issue GH-160
  reported by Brett T. Warden.
  
• t/local/01_pod.t now requires Test::Pod 1.41 to work with Pod syntax
  used with Net::SSLeay 1.88 and later. This fixes GitHub issue GH-147
  reported by Ulrik Haugen.