Remove X509ExtensionType reference
Remove X509ExtensionType reference

mitghi/pyopenssl,sholsapp/pyopenssl,hynek/pyopenssl,mhils/pyopenssl,hynek/pyopenssl,mschmo/pyopenssl,daodaoliang/pyopenssl,reaperhulk/pyopenssl,aalba6675/pyopenssl,mhils/pyopenssl,adamwolf/pyopenssl,kjav/pyopenssl,reaperhulk/pyopenssl,sorenh/pyopenssl,aalba6675/pyopenssl,r0ro/pyopenssl,samv/pyopenssl,mitghi/pyopenssl,pyca/pyopenssl,r0ro/pyopenssl