openssl: support OpenSSL 1.1.0's new multi-threading API

* ext/openssl/extconf.rb: Check absence of CRYPTO_lock() to see if the
  OpenSSL has the new threading API. In OpenSSL <= 1.0.2, an application
  had to set locking callbacks to use OpenSSL in a multi-threaded
  environment. OpenSSL 1.1.0 now finds pthreads or Windows threads so we
  don't need to do something special.
  [ruby-core:75225] [Feature #12324]

  Also check existence of *_up_ref(). Some structures in OpenSSL have
  a reference counter. We used to increment it with CRYPTO_add() which
  is a part of the old API.

* ext/openssl/openssl_missing.h: Implement *_up_ref() if missing.

* ext/openssl/ossl.c: Don't set locking callbacks if unneeded.

* ext/openssl/ossl_pkey.c, ext/openssl/ossl_ssl.c,
  ext/openssl/ossl_x509cert.c, ext/openssl/ossl_x509crl.c,
  ext/openssl/ossl_x509store.c: Use *_up_ref() instead of CRYPTO_add().

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55283 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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