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merge revision(s) 58742,59081: [Backport #11033]

    Search SSL libraries by testing various filename patterns

    * ext/openssl/extconf.rb (find_openssl_library): should search by more flexible
      method, especially for LibreSSL on Windows.

    openssl: import v2.0.4

    Import Ruby/OpenSSL 2.0.4. Only bug (and typo) fixes. The full commit
    history since v2.0.3 (imported at r57482) can be found at:

      https://github.com/ruby/openssl/compare/v2.0.3...v2.0.4

    This contains the fix for [Bug #11033].

    ----------------------------------------------------------------
    Jun Aruga (1):
          Update .travis.yml and Dockerfile

    Kazuki Yamaguchi (9):
          test/test_pkey_ec: do not use dummy 0 order
          test/test_ssl: fix typo in test_sysread_and_syswrite
          ssl: check return value of SSL_set_fd()
          Fix typos
          test/test_x509store: skip OpenSSL::TestX509Store#test_set_errors
          tool/sync-with-trunk: 'LASY' -> 'LAST'
          x509store: clear error queue after calling X509_LOOKUP_load_file()
          extconf.rb: simplify searching libraries logic
          Ruby/OpenSSL 2.0.4

    SHIBATA Hiroshi (1):
          Fix typos

    Vladimir Rybas (1):
          Fix documentation for OpenSSL::Cipher#final

    nobu (2):
          openssl: fix broken openssl check
          openssl: fix broken openssl check

    usa (1):
          Search SSL libraries by testing various filename patterns

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@59489 b2dd03c8-39d4-4d8f-98ff-823fe69b080e