GH371: Print debug info for ALPN extension

Also known as RT 4106
Signed-off-by: NRich Salz <rsalz@akamai.com>
Reviewed-by: NMatt Caswell <matt@openssl.org>

apps/s_cb.c

@@ -710,6 +710,10 @@ static STRINT_PAIR tlsext_types[] = {
 #endif
 #ifdef TLSEXT_TYPE_encrypt_then_mac
     {"encrypt-then-mac", TLSEXT_TYPE_encrypt_then_mac},
+#endif
+#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
+    {"application layer protocol negotiation",
+     TLSEXT_TYPE_application_layer_protocol_negotiation},
 #endif
     {NULL}
 };