compatibility stuff. and remove DEFINE_ALLOC_WRAPPER from
all sources.
* ext/openssl/ossl_x509ext.c (X509::Extension.new): new method.
* ext/openssl/ossl_x509ext.c (X509::Extension#oid=): new method.
* ext/openssl/ossl_x509ext.c (X509::Extension#value=): new method.
* ext/openssl/ossl_x509ext.c (X509::Extension#critical=): new method.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4522 b2dd03c8-39d4-4d8f-98ff-823fe69b080e