disable peer name check (D18162775) when OpenSSL is too old

Summary: D18162775 added this code, which doesn't compile on OpenSSL 1.0.1 (e.g. on Debian 8, which is still supported).

Differential Revision: D19032946

fbshipit-source-id: 0f005186e4c9dbaaa76ffce2b62150d92135801b

folly/io/async/AsyncSSLSocket.cpp

@@ -724,6 +724,9 @@ bool AsyncSSLSocket::applyVerificationOptions(const ssl::SSLUniquePtr& ssl) {
   if (verifyPeer_ == SSLContext::SSLVerifyPeerEnum::USE_CTX) {
     if (ctx_->needsPeerVerification()) {
       if (ctx_->checkPeerName()) {
+#if FOLLY_OPENSSL_IS_100 || FOLLY_OPENSSL_IS_101
+        return false;
+#else
         std::string peerNameToVerify = !ctx_->peerFixedName().empty()
             ? ctx_->peerFixedName()
             : tlsextHostname_;
@@ -733,6 +736,7 @@ bool AsyncSSLSocket::applyVerificationOptions(const ssl::SSLUniquePtr& ssl) {
                 param, peerNameToVerify.c_str(), peerNameToVerify.length())) {
           return false;
         }
+#endif // FOLLY_OPENSSL_IS_100 || FOLLY_OPENSSL_IS_101
       }
 
       SSL_set_verify(