Fix list of SSL error codes for older OpenSSL versions.

Apparently 1.0.1 lacks SSL_R_VERSION_TOO_HIGH and
SSL_R_VERSION_TOO_LOW.  Per buildfarm.

src/backend/libpq/be-secure-openssl.c

@@ -474,11 +474,13 @@ aloop:
 					case SSL_R_UNKNOWN_PROTOCOL:
 					case SSL_R_UNKNOWN_SSL_VERSION:
 					case SSL_R_UNSUPPORTED_SSL_VERSION:
-					case SSL_R_VERSION_TOO_HIGH:
-					case SSL_R_VERSION_TOO_LOW:
 					case SSL_R_WRONG_SSL_VERSION:
 					case SSL_R_WRONG_VERSION_NUMBER:
 					case SSL_R_TLSV1_ALERT_PROTOCOL_VERSION:
+#ifdef SSL_R_VERSION_TOO_HIGH
+					case SSL_R_VERSION_TOO_HIGH:
+					case SSL_R_VERSION_TOO_LOW:
+#endif
 						give_proto_hint = true;
 						break;
 					default:

src/interfaces/libpq/fe-secure-openssl.c

@@ -1326,11 +1326,13 @@ open_client_SSL(PGconn *conn)
 						case SSL_R_UNKNOWN_PROTOCOL:
 						case SSL_R_UNKNOWN_SSL_VERSION:
 						case SSL_R_UNSUPPORTED_SSL_VERSION:
-						case SSL_R_VERSION_TOO_HIGH:
-						case SSL_R_VERSION_TOO_LOW:
 						case SSL_R_WRONG_SSL_VERSION:
 						case SSL_R_WRONG_VERSION_NUMBER:
 						case SSL_R_TLSV1_ALERT_PROTOCOL_VERSION:
+#ifdef SSL_R_VERSION_TOO_HIGH
+						case SSL_R_VERSION_TOO_HIGH:
+						case SSL_R_VERSION_TOO_LOW:
+#endif
 							appendPQExpBuffer(&conn->errorMessage,
 											  libpq_gettext("This may indicate that the server does not support any SSL protocol version between %s and %s.\n"),
 											  conn->ssl_min_protocol_version ?