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* ext/openssl/extconf.rb: Should check SSLv2_*method.
  openssl compiled with "no-ssl2" the extconf don't fail 
  when running `make' having this compilation errors.
  Patched by Laurent Arnoud. fixes #4562, #4556

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@31816 b2dd03c8-39d4-4d8f-98ff-823fe69b080e